feat(quando-5ib): implement date inspection methods
Implement comprehensive date inspection API for querying metadata: Individual methods: - WeekNumber() - ISO 8601 week numbers (1-53) - Quarter() - Fiscal quarters (1-4) - DayOfYear() - Julian day (1-366) - IsWeekend() - Weekend detection (Sat/Sun) - IsLeapYear() - Leap year detection (4/100/400 rule) Aggregated method: - Info() - Returns DateInfo struct with all metadata + Unix timestamp Implementation details: - Delegates to stdlib: WeekNumber uses time.ISOWeek(), DayOfYear uses time.YearDay() - Zero allocations for all operations - Performance: All methods < 60ns (far exceeds <1µs target) - ISO 8601 compliant week numbers (Week 1 contains Thursday) - Handles edge cases: year boundaries, week 53, century leap years Testing: - 83 comprehensive test cases covering all methods - Edge cases: year boundaries, week 53, leap years, century rules - 6 benchmarks (all <1µs, zero allocations) - 8 example tests with clear documentation - Coverage: 97.7% Files: - inspect.go: 145 lines (6 methods + DateInfo struct) - inspect_test.go: 464 lines (tests + benchmarks) - example_test.go: +124 lines (8 examples)
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{"id":"quando-36t","title":"Error types and handling","description":"Define custom error types and establish error handling patterns for the library.\n\n**Sentinel Errors:**\n```go\nvar (\n ErrInvalidFormat = errors.New(\"invalid date format\")\n ErrInvalidTimezone = errors.New(\"invalid timezone\")\n ErrOverflow = errors.New(\"date overflow\")\n)\n```\n\n**Error Handling Principles:**\n1. NEVER panic (except Must* variants)\n2. Use sentinel errors for known error types\n3. Wrap errors with fmt.Errorf(\"%w\") for context\n4. Return clear, actionable error messages\n\n**Error Categories:**\n- Parse errors: Invalid formats, ambiguous inputs\n- Timezone errors: Unknown IANA names\n- Overflow errors: Date arithmetic outside Go's time.Time range\n\n**Documentation:**\n- Document that library never panics in normal operation\n- Document that Must* variants DO panic\n- Provide error handling examples\n\n## Acceptance Criteria\n- [ ] errors.go file created\n- [ ] ErrInvalidFormat defined\n- [ ] ErrInvalidTimezone defined\n- [ ] ErrOverflow defined\n- [ ] Godoc for each error with usage context\n- [ ] Documentation of no-panic policy\n- [ ] Documentation of Must* panic behavior\n- [ ] Example tests showing error handling patterns","status":"closed","priority":1,"issue_type":"task","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:22:22.314746489+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T17:40:06.634744398+01:00","closed_at":"2026-02-11T17:40:06.634744398+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-36t","depends_on_id":"quando-91w","type":"blocks","created_at":"2026-02-11T16:23:05.380454674+01:00","created_by":"Oliver Jakoubek"}],"comments":[{"id":8,"issue_id":"quando-36t","author":"Oliver Jakoubek","text":"Plan: 1) Create errors.go with sentinel errors (ErrInvalidFormat, ErrInvalidTimezone, ErrOverflow), 2) Add comprehensive godoc comments for each error with usage context, 3) Document no-panic policy in package documentation, 4) Document Must* variant panic behavior, 5) Add example tests showing error handling patterns (error checking, unwrapping)","created_at":"2026-02-11T16:38:47Z"}]}
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{"id":"quando-36t","title":"Error types and handling","description":"Define custom error types and establish error handling patterns for the library.\n\n**Sentinel Errors:**\n```go\nvar (\n ErrInvalidFormat = errors.New(\"invalid date format\")\n ErrInvalidTimezone = errors.New(\"invalid timezone\")\n ErrOverflow = errors.New(\"date overflow\")\n)\n```\n\n**Error Handling Principles:**\n1. NEVER panic (except Must* variants)\n2. Use sentinel errors for known error types\n3. Wrap errors with fmt.Errorf(\"%w\") for context\n4. Return clear, actionable error messages\n\n**Error Categories:**\n- Parse errors: Invalid formats, ambiguous inputs\n- Timezone errors: Unknown IANA names\n- Overflow errors: Date arithmetic outside Go's time.Time range\n\n**Documentation:**\n- Document that library never panics in normal operation\n- Document that Must* variants DO panic\n- Provide error handling examples\n\n## Acceptance Criteria\n- [ ] errors.go file created\n- [ ] ErrInvalidFormat defined\n- [ ] ErrInvalidTimezone defined\n- [ ] ErrOverflow defined\n- [ ] Godoc for each error with usage context\n- [ ] Documentation of no-panic policy\n- [ ] Documentation of Must* panic behavior\n- [ ] Example tests showing error handling patterns","status":"closed","priority":1,"issue_type":"task","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:22:22.314746489+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T17:40:06.634744398+01:00","closed_at":"2026-02-11T17:40:06.634744398+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-36t","depends_on_id":"quando-91w","type":"blocks","created_at":"2026-02-11T16:23:05.380454674+01:00","created_by":"Oliver Jakoubek"}],"comments":[{"id":8,"issue_id":"quando-36t","author":"Oliver Jakoubek","text":"Plan: 1) Create errors.go with sentinel errors (ErrInvalidFormat, ErrInvalidTimezone, ErrOverflow), 2) Add comprehensive godoc comments for each error with usage context, 3) Document no-panic policy in package documentation, 4) Document Must* variant panic behavior, 5) Add example tests showing error handling patterns (error checking, unwrapping)","created_at":"2026-02-11T16:38:47Z"}]}
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{"id":"quando-41g","title":"Timezone support and conversion","description":"Implement timezone conversion with proper DST handling.\n\n**API:**\n```go\nfunc (d Date) In(location string) (Date, error)\n```\n\n**Behavior:**\n- Convert date to specified IANA timezone\n- Return error for invalid timezone names (never panic)\n- Use IANA Timezone Database\n- Default timezone: UTC if not specified\n\n**DST Handling:**\nCritical: `Add(1, Days)` means \"same time next calendar day\", NOT 24 hours\n- Example: 2026-03-31 02:00 CET + 1 Day = 2026-04-01 02:00 CEST\n- This is only 23 actual hours due to DST transition\n- Rationale: Humans think in calendar days, not hour deltas\n\n**Error Handling:**\n- Validate IANA timezone names\n- Return clear error for unknown timezones\n- Return clear error for empty timezone string\n\n## Acceptance Criteria\n- [ ] In(location) implemented\n- [ ] Uses IANA Timezone Database\n- [ ] Converts to specified timezone correctly\n- [ ] Invalid timezone names return error\n- [ ] Empty string returns error\n- [ ] Never panics on invalid input\n- [ ] DST handling: Add(Days) preserves wall clock time\n- [ ] Tests across DST transitions (spring and fall)\n- [ ] Tests for multiple timezones (Europe/Berlin, America/New_York, etc.)\n- [ ] Unit tests with 95%+ coverage\n- [ ] Godoc with DST behavior clearly explained\n- [ ] Example showing DST-safe arithmetic","status":"closed","priority":1,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:22:14.704688038+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T19:18:57.926412162+01:00","closed_at":"2026-02-11T19:18:57.926412162+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-41g","depends_on_id":"quando-j2s","type":"blocks","created_at":"2026-02-11T16:23:13.346573362+01:00","created_by":"Oliver Jakoubek"},{"issue_id":"quando-41g","depends_on_id":"quando-36t","type":"blocks","created_at":"2026-02-11T16:23:13.384247178+01:00","created_by":"Oliver Jakoubek"}]}
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{"id":"quando-41g","title":"Timezone support and conversion","description":"Implement timezone conversion with proper DST handling.\n\n**API:**\n```go\nfunc (d Date) In(location string) (Date, error)\n```\n\n**Behavior:**\n- Convert date to specified IANA timezone\n- Return error for invalid timezone names (never panic)\n- Use IANA Timezone Database\n- Default timezone: UTC if not specified\n\n**DST Handling:**\nCritical: `Add(1, Days)` means \"same time next calendar day\", NOT 24 hours\n- Example: 2026-03-31 02:00 CET + 1 Day = 2026-04-01 02:00 CEST\n- This is only 23 actual hours due to DST transition\n- Rationale: Humans think in calendar days, not hour deltas\n\n**Error Handling:**\n- Validate IANA timezone names\n- Return clear error for unknown timezones\n- Return clear error for empty timezone string\n\n## Acceptance Criteria\n- [ ] In(location) implemented\n- [ ] Uses IANA Timezone Database\n- [ ] Converts to specified timezone correctly\n- [ ] Invalid timezone names return error\n- [ ] Empty string returns error\n- [ ] Never panics on invalid input\n- [ ] DST handling: Add(Days) preserves wall clock time\n- [ ] Tests across DST transitions (spring and fall)\n- [ ] Tests for multiple timezones (Europe/Berlin, America/New_York, etc.)\n- [ ] Unit tests with 95%+ coverage\n- [ ] Godoc with DST behavior clearly explained\n- [ ] Example showing DST-safe arithmetic","status":"closed","priority":1,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:22:14.704688038+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T19:18:57.926412162+01:00","closed_at":"2026-02-11T19:18:57.926412162+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-41g","depends_on_id":"quando-j2s","type":"blocks","created_at":"2026-02-11T16:23:13.346573362+01:00","created_by":"Oliver Jakoubek"},{"issue_id":"quando-41g","depends_on_id":"quando-36t","type":"blocks","created_at":"2026-02-11T16:23:13.384247178+01:00","created_by":"Oliver Jakoubek"}]}
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{"id":"quando-4bh","title":"Unit type and constants","description":"Define Unit type for time unit constants used in arithmetic operations.\n\n**Technical Details:**\n```go\ntype Unit int\n\nconst (\n Seconds Unit = iota\n Minutes\n Hours\n Days\n Weeks\n Months\n Quarters\n Years\n)\n```\n\n**Design:**\n- Type-safe constants (compile-time safety)\n- Use iota for clear ordering\n- Optional internal ParseUnit(string) for external inputs\n\n## Acceptance Criteria\n- [ ] Unit type defined as int\n- [ ] All 8 unit constants defined (Seconds through Years)\n- [ ] Units use iota for ordering\n- [ ] Godoc comments for Unit type and constants\n- [ ] Unit tests verifying constants","status":"closed","priority":0,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:20:37.246514285+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T16:34:46.001417204+01:00","closed_at":"2026-02-11T16:34:46.001417204+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-4bh","depends_on_id":"quando-91w","type":"blocks","created_at":"2026-02-11T16:23:05.349519431+01:00","created_by":"Oliver Jakoubek"}],"comments":[{"id":4,"issue_id":"quando-4bh","author":"Oliver Jakoubek","text":"Plan: 1) Create unit.go with Unit type as int, 2) Define all 8 unit constants (Seconds, Minutes, Hours, Days, Weeks, Months, Quarters, Years) using iota, 3) Add String() method for better debugging, 4) Add comprehensive godoc comments, 5) Write unit tests verifying constants and ordering, 6) Add example tests","created_at":"2026-02-11T15:33:41Z"}]}
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{"id":"quando-4bh","title":"Unit type and constants","description":"Define Unit type for time unit constants used in arithmetic operations.\n\n**Technical Details:**\n```go\ntype Unit int\n\nconst (\n Seconds Unit = iota\n Minutes\n Hours\n Days\n Weeks\n Months\n Quarters\n Years\n)\n```\n\n**Design:**\n- Type-safe constants (compile-time safety)\n- Use iota for clear ordering\n- Optional internal ParseUnit(string) for external inputs\n\n## Acceptance Criteria\n- [ ] Unit type defined as int\n- [ ] All 8 unit constants defined (Seconds through Years)\n- [ ] Units use iota for ordering\n- [ ] Godoc comments for Unit type and constants\n- [ ] Unit tests verifying constants","status":"closed","priority":0,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:20:37.246514285+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T16:34:46.001417204+01:00","closed_at":"2026-02-11T16:34:46.001417204+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-4bh","depends_on_id":"quando-91w","type":"blocks","created_at":"2026-02-11T16:23:05.349519431+01:00","created_by":"Oliver Jakoubek"}],"comments":[{"id":4,"issue_id":"quando-4bh","author":"Oliver Jakoubek","text":"Plan: 1) Create unit.go with Unit type as int, 2) Define all 8 unit constants (Seconds, Minutes, Hours, Days, Weeks, Months, Quarters, Years) using iota, 3) Add String() method for better debugging, 4) Add comprehensive godoc comments, 5) Write unit tests verifying constants and ordering, 6) Add example tests","created_at":"2026-02-11T15:33:41Z"}]}
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{"id":"quando-5ib","title":"Date inspection methods","description":"Implement date inspection methods for querying metadata about a date.\n\n**Individual Methods:**\n```go\nfunc (d Date) WeekNumber() int\nfunc (d Date) Quarter() int\nfunc (d Date) DayOfYear() int\nfunc (d Date) IsWeekend() bool\nfunc (d Date) IsLeapYear() bool\n```\n\n**Aggregated Method:**\n```go\ntype DateInfo struct {\n WeekNumber int\n Quarter int\n DayOfYear int\n IsWeekend bool\n IsLeapYear bool\n Unix int64\n}\n\nfunc (d Date) Info() DateInfo\n```\n\n**Specifications:**\n- **WeekNumber**: ISO 8601 (Monday first, Week 1 = first week containing Thursday)\n- **Quarter**: 1-4 (Q1=Jan-Mar, Q2=Apr-Jun, Q3=Jul-Sep, Q4=Oct-Dec)\n- **DayOfYear**: 1-366 (considering leap years)\n- **IsWeekend**: Saturday or Sunday (not configurable in Phase 1)\n- **IsLeapYear**: Divisible by 4, except centuries, except divisible by 400\n\n## Acceptance Criteria\n- [ ] WeekNumber() returns ISO 8601 week number\n- [ ] Quarter() returns 1-4\n- [ ] DayOfYear() returns 1-366\n- [ ] IsWeekend() returns true for Sat/Sun\n- [ ] IsLeapYear() returns true for leap years\n- [ ] Info() returns struct with all fields\n- [ ] ISO 8601 week compliance (Week 1 contains Thursday)\n- [ ] Leap year rules correct (4, 100, 400 rule)\n- [ ] Unit tests for all methods\n- [ ] Edge cases: year boundaries, week 53, leap years\n- [ ] Benchmarks meet \u003c1µs target\n- [ ] Godoc for each method with conventions documented","status":"open","priority":2,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:22:06.966079923+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T16:22:06.966079923+01:00","dependencies":[{"issue_id":"quando-5ib","depends_on_id":"quando-j2s","type":"blocks","created_at":"2026-02-11T16:23:13.310800388+01:00","created_by":"Oliver Jakoubek"}]}
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{"id":"quando-5ib","title":"Date inspection methods","description":"Implement date inspection methods for querying metadata about a date.\n\n**Individual Methods:**\n```go\nfunc (d Date) WeekNumber() int\nfunc (d Date) Quarter() int\nfunc (d Date) DayOfYear() int\nfunc (d Date) IsWeekend() bool\nfunc (d Date) IsLeapYear() bool\n```\n\n**Aggregated Method:**\n```go\ntype DateInfo struct {\n WeekNumber int\n Quarter int\n DayOfYear int\n IsWeekend bool\n IsLeapYear bool\n Unix int64\n}\n\nfunc (d Date) Info() DateInfo\n```\n\n**Specifications:**\n- **WeekNumber**: ISO 8601 (Monday first, Week 1 = first week containing Thursday)\n- **Quarter**: 1-4 (Q1=Jan-Mar, Q2=Apr-Jun, Q3=Jul-Sep, Q4=Oct-Dec)\n- **DayOfYear**: 1-366 (considering leap years)\n- **IsWeekend**: Saturday or Sunday (not configurable in Phase 1)\n- **IsLeapYear**: Divisible by 4, except centuries, except divisible by 400\n\n## Acceptance Criteria\n- [ ] WeekNumber() returns ISO 8601 week number\n- [ ] Quarter() returns 1-4\n- [ ] DayOfYear() returns 1-366\n- [ ] IsWeekend() returns true for Sat/Sun\n- [ ] IsLeapYear() returns true for leap years\n- [ ] Info() returns struct with all fields\n- [ ] ISO 8601 week compliance (Week 1 contains Thursday)\n- [ ] Leap year rules correct (4, 100, 400 rule)\n- [ ] Unit tests for all methods\n- [ ] Edge cases: year boundaries, week 53, leap years\n- [ ] Benchmarks meet \u003c1µs target\n- [ ] Godoc for each method with conventions documented","status":"closed","priority":2,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:22:06.966079923+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T20:45:38.905860871+01:00","closed_at":"2026-02-11T20:45:38.905860871+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-5ib","depends_on_id":"quando-j2s","type":"blocks","created_at":"2026-02-11T16:23:13.310800388+01:00","created_by":"Oliver Jakoubek"}]}
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{"id":"quando-5ol","title":"Format presets and constants","description":"Implement preset format constants and Format() method.\n\n**API:**\n```go\ntype Format int\n\nconst (\n ISO Format = iota // \"2026-02-09\"\n EU // \"09.02.2026\"\n US // \"02/09/2026\"\n Long // \"February 9, 2026\" (language-dependent)\n RFC2822 // \"Mon, 09 Feb 2026 00:00:00 +0000\"\n)\n\nfunc (d Date) Format(format Format) string\n```\n\n**Language Dependency:**\n- ISO, EU, US, RFC2822: Always language-independent\n- Long: Uses Lang setting\n - EN: \"February 9, 2026\"\n - DE: \"9. Februar 2026\"\n\n**Implementation:**\n- Map Format constants to Go layout strings\n- Use Lang() setting for Long format\n- Delegate to time.Format() internally\n\n## Acceptance Criteria\n- [ ] Format type and constants defined\n- [ ] Format() method implemented\n- [ ] ISO format outputs \"YYYY-MM-DD\"\n- [ ] EU format outputs \"DD.MM.YYYY\"\n- [ ] US format outputs \"MM/DD/YYYY\"\n- [ ] RFC2822 format correct\n- [ ] Long format respects Lang setting (EN and DE)\n- [ ] Non-Long formats ignore Lang setting\n- [ ] Unit tests for all formats\n- [ ] Unit tests for Long with both EN and DE\n- [ ] Benchmark meets \u003c5µs without i18n, \u003c10µs with i18n\n- [ ] Godoc for each format constant\n- [ ] Example tests showing each format","status":"closed","priority":2,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:21:53.217816331+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T20:11:47.455205479+01:00","closed_at":"2026-02-11T20:11:47.455205479+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-5ol","depends_on_id":"quando-j2s","type":"blocks","created_at":"2026-02-11T16:23:12.164278602+01:00","created_by":"Oliver Jakoubek"},{"issue_id":"quando-5ol","depends_on_id":"quando-zbr","type":"blocks","created_at":"2026-02-11T16:23:12.20045666+01:00","created_by":"Oliver Jakoubek"}]}
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{"id":"quando-5ol","title":"Format presets and constants","description":"Implement preset format constants and Format() method.\n\n**API:**\n```go\ntype Format int\n\nconst (\n ISO Format = iota // \"2026-02-09\"\n EU // \"09.02.2026\"\n US // \"02/09/2026\"\n Long // \"February 9, 2026\" (language-dependent)\n RFC2822 // \"Mon, 09 Feb 2026 00:00:00 +0000\"\n)\n\nfunc (d Date) Format(format Format) string\n```\n\n**Language Dependency:**\n- ISO, EU, US, RFC2822: Always language-independent\n- Long: Uses Lang setting\n - EN: \"February 9, 2026\"\n - DE: \"9. Februar 2026\"\n\n**Implementation:**\n- Map Format constants to Go layout strings\n- Use Lang() setting for Long format\n- Delegate to time.Format() internally\n\n## Acceptance Criteria\n- [ ] Format type and constants defined\n- [ ] Format() method implemented\n- [ ] ISO format outputs \"YYYY-MM-DD\"\n- [ ] EU format outputs \"DD.MM.YYYY\"\n- [ ] US format outputs \"MM/DD/YYYY\"\n- [ ] RFC2822 format correct\n- [ ] Long format respects Lang setting (EN and DE)\n- [ ] Non-Long formats ignore Lang setting\n- [ ] Unit tests for all formats\n- [ ] Unit tests for Long with both EN and DE\n- [ ] Benchmark meets \u003c5µs without i18n, \u003c10µs with i18n\n- [ ] Godoc for each format constant\n- [ ] Example tests showing each format","status":"closed","priority":2,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:21:53.217816331+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T20:11:47.455205479+01:00","closed_at":"2026-02-11T20:11:47.455205479+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-5ol","depends_on_id":"quando-j2s","type":"blocks","created_at":"2026-02-11T16:23:12.164278602+01:00","created_by":"Oliver Jakoubek"},{"issue_id":"quando-5ol","depends_on_id":"quando-zbr","type":"blocks","created_at":"2026-02-11T16:23:12.20045666+01:00","created_by":"Oliver Jakoubek"}]}
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{"id":"quando-6c3","title":"CI/CD pipeline setup","description":"Set up GitHub Actions CI/CD pipeline for automated testing and quality checks.\n\n**CI Workflow:**\n- Run on push and pull requests\n- Test on multiple Go versions (1.22, 1.23, latest)\n- Test on multiple platforms (Linux, macOS, Windows)\n- Run go fmt check\n- Run go vet\n- Run tests with coverage\n- Run benchmarks (informational)\n- Optional: golangci-lint\n\n**Coverage Reporting:**\n- Generate coverage report\n- Fail if coverage \u003c95% for core calculation functions\n- Optional: Upload to codecov.io or similar\n\n**Performance Monitoring:**\n- Run benchmarks on each commit\n- Report benchmark results (informational, no fail)\n\n## Acceptance Criteria\n- [ ] .github/workflows/ci.yml created\n- [ ] Tests run on push and PR\n- [ ] Multi-version Go support (1.22+)\n- [ ] Multi-platform support (Linux, macOS, Windows)\n- [ ] go fmt check passes\n- [ ] go vet check passes\n- [ ] Tests run with coverage report\n- [ ] Coverage requirement enforced (95%+)\n- [ ] Benchmarks run (informational)\n- [ ] CI badge in README (if applicable)","status":"tombstone","priority":3,"issue_type":"task","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:22:51.928117055+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T19:21:16.246958875+01:00","dependencies":[{"issue_id":"quando-6c3","depends_on_id":"quando-r1o","type":"blocks","created_at":"2026-02-11T16:23:16.259739409+01:00","created_by":"Oliver Jakoubek"}],"deleted_at":"2026-02-11T19:21:16.246958875+01:00","deleted_by":"daemon","delete_reason":"delete","original_type":"task"}
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{"id":"quando-6c3","title":"CI/CD pipeline setup","description":"Set up GitHub Actions CI/CD pipeline for automated testing and quality checks.\n\n**CI Workflow:**\n- Run on push and pull requests\n- Test on multiple Go versions (1.22, 1.23, latest)\n- Test on multiple platforms (Linux, macOS, Windows)\n- Run go fmt check\n- Run go vet\n- Run tests with coverage\n- Run benchmarks (informational)\n- Optional: golangci-lint\n\n**Coverage Reporting:**\n- Generate coverage report\n- Fail if coverage \u003c95% for core calculation functions\n- Optional: Upload to codecov.io or similar\n\n**Performance Monitoring:**\n- Run benchmarks on each commit\n- Report benchmark results (informational, no fail)\n\n## Acceptance Criteria\n- [ ] .github/workflows/ci.yml created\n- [ ] Tests run on push and PR\n- [ ] Multi-version Go support (1.22+)\n- [ ] Multi-platform support (Linux, macOS, Windows)\n- [ ] go fmt check passes\n- [ ] go vet check passes\n- [ ] Tests run with coverage report\n- [ ] Coverage requirement enforced (95%+)\n- [ ] Benchmarks run (informational)\n- [ ] CI badge in README (if applicable)","status":"tombstone","priority":3,"issue_type":"task","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:22:51.928117055+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T19:21:16.246958875+01:00","dependencies":[{"issue_id":"quando-6c3","depends_on_id":"quando-r1o","type":"blocks","created_at":"2026-02-11T16:23:16.259739409+01:00","created_by":"Oliver Jakoubek"}],"deleted_at":"2026-02-11T19:21:16.246958875+01:00","deleted_by":"daemon","delete_reason":"delete","original_type":"task"}
|
||||||
{"id":"quando-6x3","title":"Documentation and examples","description":"Complete documentation including README, godoc, and example code.\n\n**README.md Contents:**\n- Project overview and vision\n- Installation instructions (go get)\n- Quick start examples\n- Core features showcase\n- Performance characteristics\n- Comparison to time.Time\n- Contributing guidelines\n- License\n\n**Godoc Requirements:**\n- Every exported type/function documented\n- Godoc comments start with type/function name\n- Complex behaviors explained (month-end overflow, DST, etc.)\n- Edge cases noted where applicable\n\n**Example Tests:**\n- Example_basicArithmetic\n- Example_monthEndOverflow\n- Example_snapOperations\n- Example_diffCalculation\n- Example_humanFormat\n- Example_parsing\n- Example_formatting\n- Example_timezoneConversion\n- Example_chainedOperations\n\n**Code Examples in README:**\n- Complex chaining\n- Month-end handling\n- Human-readable diffs\n- Timezone-aware operations\n- Comparison with stdlib\n\n## Acceptance Criteria\n- [ ] README.md complete with all sections\n- [ ] Installation instructions clear\n- [ ] At least 5 code examples in README\n- [ ] All exported items have godoc comments\n- [ ] Godoc comments follow conventions (name first)\n- [ ] At least 8 example tests\n- [ ] Examples demonstrate key features\n- [ ] Edge cases documented in relevant godoc\n- [ ] Comparison table with time.Time\n- [ ] Contributing guidelines (if open source)","status":"open","priority":3,"issue_type":"task","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:22:45.693695262+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T16:22:45.693695262+01:00","dependencies":[{"issue_id":"quando-6x3","depends_on_id":"quando-r1o","type":"blocks","created_at":"2026-02-11T16:23:16.222906911+01:00","created_by":"Oliver Jakoubek"}]}
|
{"id":"quando-6x3","title":"Documentation and examples","description":"Complete documentation including README, godoc, and example code.\n\n**README.md Contents:**\n- Project overview and vision\n- Installation instructions (go get)\n- Quick start examples\n- Core features showcase\n- Performance characteristics\n- Comparison to time.Time\n- Contributing guidelines\n- License\n\n**Godoc Requirements:**\n- Every exported type/function documented\n- Godoc comments start with type/function name\n- Complex behaviors explained (month-end overflow, DST, etc.)\n- Edge cases noted where applicable\n\n**Example Tests:**\n- Example_basicArithmetic\n- Example_monthEndOverflow\n- Example_snapOperations\n- Example_diffCalculation\n- Example_humanFormat\n- Example_parsing\n- Example_formatting\n- Example_timezoneConversion\n- Example_chainedOperations\n\n**Code Examples in README:**\n- Complex chaining\n- Month-end handling\n- Human-readable diffs\n- Timezone-aware operations\n- Comparison with stdlib\n\n## Acceptance Criteria\n- [ ] README.md complete with all sections\n- [ ] Installation instructions clear\n- [ ] At least 5 code examples in README\n- [ ] All exported items have godoc comments\n- [ ] Godoc comments follow conventions (name first)\n- [ ] At least 8 example tests\n- [ ] Examples demonstrate key features\n- [ ] Edge cases documented in relevant godoc\n- [ ] Comparison table with time.Time\n- [ ] Contributing guidelines (if open source)","status":"open","priority":3,"issue_type":"task","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:22:45.693695262+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T16:22:45.693695262+01:00","dependencies":[{"issue_id":"quando-6x3","depends_on_id":"quando-r1o","type":"blocks","created_at":"2026-02-11T16:23:16.222906911+01:00","created_by":"Oliver Jakoubek"}]}
|
||||||
|
|
|
||||||
142
example_test.go
142
example_test.go
|
|
@ -774,3 +774,145 @@ func ExampleDate_FormatLayout_comparison() {
|
||||||
// FormatLayout(ISO): 2026-02-09
|
// FormatLayout(ISO): 2026-02-09
|
||||||
// FormatLayout(custom style): Mon, Feb 9
|
// FormatLayout(custom style): Mon, Feb 9
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// ExampleDate_WeekNumber demonstrates ISO 8601 week number calculation
|
||||||
|
func ExampleDate_WeekNumber() {
|
||||||
|
date := quando.From(time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC))
|
||||||
|
fmt.Printf("Week number: %d\n", date.WeekNumber())
|
||||||
|
// Output: Week number: 7
|
||||||
|
}
|
||||||
|
|
||||||
|
// ExampleDate_WeekNumber_yearBoundary demonstrates week numbers at year boundaries
|
||||||
|
func ExampleDate_WeekNumber_yearBoundary() {
|
||||||
|
// Jan 1, 2023 (Sunday) belongs to week 52 of 2022
|
||||||
|
jan1 := quando.From(time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC))
|
||||||
|
fmt.Printf("2023-01-01: Week %d\n", jan1.WeekNumber())
|
||||||
|
|
||||||
|
// Jan 2, 2023 (Monday) is week 1 of 2023
|
||||||
|
jan2 := quando.From(time.Date(2023, 1, 2, 0, 0, 0, 0, time.UTC))
|
||||||
|
fmt.Printf("2023-01-02: Week %d\n", jan2.WeekNumber())
|
||||||
|
|
||||||
|
// Dec 31, 2026 (Thursday) is week 53
|
||||||
|
dec31 := quando.From(time.Date(2026, 12, 31, 0, 0, 0, 0, time.UTC))
|
||||||
|
fmt.Printf("2026-12-31: Week %d\n", dec31.WeekNumber())
|
||||||
|
// Output:
|
||||||
|
// 2023-01-01: Week 52
|
||||||
|
// 2023-01-02: Week 1
|
||||||
|
// 2026-12-31: Week 53
|
||||||
|
}
|
||||||
|
|
||||||
|
// ExampleDate_Quarter demonstrates fiscal quarter calculation
|
||||||
|
func ExampleDate_Quarter() {
|
||||||
|
q1 := quando.From(time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC))
|
||||||
|
q2 := quando.From(time.Date(2026, 5, 15, 0, 0, 0, 0, time.UTC))
|
||||||
|
q3 := quando.From(time.Date(2026, 8, 20, 0, 0, 0, 0, time.UTC))
|
||||||
|
q4 := quando.From(time.Date(2026, 11, 25, 0, 0, 0, 0, time.UTC))
|
||||||
|
|
||||||
|
fmt.Printf("February: Q%d\n", q1.Quarter())
|
||||||
|
fmt.Printf("May: Q%d\n", q2.Quarter())
|
||||||
|
fmt.Printf("August: Q%d\n", q3.Quarter())
|
||||||
|
fmt.Printf("November: Q%d\n", q4.Quarter())
|
||||||
|
// Output:
|
||||||
|
// February: Q1
|
||||||
|
// May: Q2
|
||||||
|
// August: Q3
|
||||||
|
// November: Q4
|
||||||
|
}
|
||||||
|
|
||||||
|
// ExampleDate_DayOfYear demonstrates day of year calculation
|
||||||
|
func ExampleDate_DayOfYear() {
|
||||||
|
jan1 := quando.From(time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC))
|
||||||
|
feb9 := quando.From(time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC))
|
||||||
|
dec31 := quando.From(time.Date(2026, 12, 31, 0, 0, 0, 0, time.UTC))
|
||||||
|
|
||||||
|
fmt.Printf("Jan 1: Day %d\n", jan1.DayOfYear())
|
||||||
|
fmt.Printf("Feb 9: Day %d\n", feb9.DayOfYear())
|
||||||
|
fmt.Printf("Dec 31: Day %d\n", dec31.DayOfYear())
|
||||||
|
// Output:
|
||||||
|
// Jan 1: Day 1
|
||||||
|
// Feb 9: Day 40
|
||||||
|
// Dec 31: Day 365
|
||||||
|
}
|
||||||
|
|
||||||
|
// ExampleDate_DayOfYear_leapYear demonstrates day of year in a leap year
|
||||||
|
func ExampleDate_DayOfYear_leapYear() {
|
||||||
|
// 2024 is a leap year
|
||||||
|
feb29 := quando.From(time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC))
|
||||||
|
dec31 := quando.From(time.Date(2024, 12, 31, 0, 0, 0, 0, time.UTC))
|
||||||
|
|
||||||
|
fmt.Printf("Feb 29 (leap year): Day %d\n", feb29.DayOfYear())
|
||||||
|
fmt.Printf("Dec 31 (leap year): Day %d\n", dec31.DayOfYear())
|
||||||
|
// Output:
|
||||||
|
// Feb 29 (leap year): Day 60
|
||||||
|
// Dec 31 (leap year): Day 366
|
||||||
|
}
|
||||||
|
|
||||||
|
// ExampleDate_IsWeekend demonstrates weekend detection
|
||||||
|
func ExampleDate_IsWeekend() {
|
||||||
|
monday := quando.From(time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC)) // Monday
|
||||||
|
saturday := quando.From(time.Date(2026, 2, 14, 0, 0, 0, 0, time.UTC)) // Saturday
|
||||||
|
sunday := quando.From(time.Date(2026, 2, 15, 0, 0, 0, 0, time.UTC)) // Sunday
|
||||||
|
|
||||||
|
fmt.Printf("Monday: %v\n", monday.IsWeekend())
|
||||||
|
fmt.Printf("Saturday: %v\n", saturday.IsWeekend())
|
||||||
|
fmt.Printf("Sunday: %v\n", sunday.IsWeekend())
|
||||||
|
// Output:
|
||||||
|
// Monday: false
|
||||||
|
// Saturday: true
|
||||||
|
// Sunday: true
|
||||||
|
}
|
||||||
|
|
||||||
|
// ExampleDate_IsLeapYear demonstrates leap year detection
|
||||||
|
func ExampleDate_IsLeapYear() {
|
||||||
|
year2024 := quando.From(time.Date(2024, 1, 1, 0, 0, 0, 0, time.UTC)) // Leap year
|
||||||
|
year2026 := quando.From(time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC)) // Not leap year
|
||||||
|
year2000 := quando.From(time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)) // Leap year (400 rule)
|
||||||
|
year1900 := quando.From(time.Date(1900, 1, 1, 0, 0, 0, 0, time.UTC)) // Not leap year (100 rule)
|
||||||
|
|
||||||
|
fmt.Printf("2024: %v\n", year2024.IsLeapYear())
|
||||||
|
fmt.Printf("2026: %v\n", year2026.IsLeapYear())
|
||||||
|
fmt.Printf("2000: %v\n", year2000.IsLeapYear())
|
||||||
|
fmt.Printf("1900: %v\n", year1900.IsLeapYear())
|
||||||
|
// Output:
|
||||||
|
// 2024: true
|
||||||
|
// 2026: false
|
||||||
|
// 2000: true
|
||||||
|
// 1900: false
|
||||||
|
}
|
||||||
|
|
||||||
|
// ExampleDate_Info demonstrates aggregated date metadata
|
||||||
|
func ExampleDate_Info() {
|
||||||
|
date := quando.From(time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC))
|
||||||
|
info := date.Info()
|
||||||
|
|
||||||
|
fmt.Printf("Week number: %d\n", info.WeekNumber)
|
||||||
|
fmt.Printf("Quarter: %d\n", info.Quarter)
|
||||||
|
fmt.Printf("Day of year: %d\n", info.DayOfYear)
|
||||||
|
fmt.Printf("Is weekend: %v\n", info.IsWeekend)
|
||||||
|
fmt.Printf("Is leap year: %v\n", info.IsLeapYear)
|
||||||
|
// Output:
|
||||||
|
// Week number: 7
|
||||||
|
// Quarter: 1
|
||||||
|
// Day of year: 40
|
||||||
|
// Is weekend: false
|
||||||
|
// Is leap year: false
|
||||||
|
}
|
||||||
|
|
||||||
|
// ExampleDate_Info_leapYear demonstrates Info() for a leap year date
|
||||||
|
func ExampleDate_Info_leapYear() {
|
||||||
|
// Saturday, Feb 29, 2024 (leap year)
|
||||||
|
date := quando.From(time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC))
|
||||||
|
info := date.Info()
|
||||||
|
|
||||||
|
fmt.Printf("Week number: %d\n", info.WeekNumber)
|
||||||
|
fmt.Printf("Quarter: %d\n", info.Quarter)
|
||||||
|
fmt.Printf("Day of year: %d\n", info.DayOfYear)
|
||||||
|
fmt.Printf("Is weekend: %v\n", info.IsWeekend)
|
||||||
|
fmt.Printf("Is leap year: %v\n", info.IsLeapYear)
|
||||||
|
// Output:
|
||||||
|
// Week number: 9
|
||||||
|
// Quarter: 1
|
||||||
|
// Day of year: 60
|
||||||
|
// Is weekend: false
|
||||||
|
// Is leap year: true
|
||||||
|
}
|
||||||
|
|
|
||||||
150
inspect.go
Normal file
150
inspect.go
Normal file
|
|
@ -0,0 +1,150 @@
|
||||||
|
package quando
|
||||||
|
|
||||||
|
import "time"
|
||||||
|
|
||||||
|
// DateInfo contains aggregated metadata about a date.
|
||||||
|
// Returned by the Info() method.
|
||||||
|
type DateInfo struct {
|
||||||
|
WeekNumber int // ISO 8601 week number (1-53)
|
||||||
|
Quarter int // Fiscal quarter (1-4)
|
||||||
|
DayOfYear int // Day of year (1-366)
|
||||||
|
IsWeekend bool // True if Saturday or Sunday
|
||||||
|
IsLeapYear bool // True if date is in a leap year
|
||||||
|
Unix int64 // Unix timestamp
|
||||||
|
}
|
||||||
|
|
||||||
|
// WeekNumber returns the ISO 8601 week number (1-53).
|
||||||
|
//
|
||||||
|
// ISO 8601 definition:
|
||||||
|
// - Week 1 is the first week with a Thursday in it
|
||||||
|
// - Weeks start on Monday and end on Sunday
|
||||||
|
// - Dates in early January may belong to week 52/53 of previous year
|
||||||
|
// - Dates in late December may belong to week 1 of next year
|
||||||
|
//
|
||||||
|
// Examples:
|
||||||
|
// - Jan 1, 2026 (Thursday) is in week 1 of 2026
|
||||||
|
// - Jan 1, 2025 (Wednesday) is in week 1 of 2025
|
||||||
|
// - Jan 1, 2024 (Monday) is in week 1 of 2024
|
||||||
|
// - Jan 1, 2023 (Sunday) is in week 52 of 2022
|
||||||
|
//
|
||||||
|
// Performance: < 1 µs, zero allocations
|
||||||
|
//
|
||||||
|
// Example:
|
||||||
|
//
|
||||||
|
// date := quando.From(time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC))
|
||||||
|
// week := date.WeekNumber() // 7
|
||||||
|
func (d Date) WeekNumber() int {
|
||||||
|
_, week := d.t.ISOWeek()
|
||||||
|
return week
|
||||||
|
}
|
||||||
|
|
||||||
|
// Quarter returns the fiscal quarter (1-4) for the date.
|
||||||
|
//
|
||||||
|
// Quarter mapping:
|
||||||
|
// - Q1: January, February, March
|
||||||
|
// - Q2: April, May, June
|
||||||
|
// - Q3: July, August, September
|
||||||
|
// - Q4: October, November, December
|
||||||
|
//
|
||||||
|
// Performance: < 1 µs, zero allocations
|
||||||
|
//
|
||||||
|
// Example:
|
||||||
|
//
|
||||||
|
// date := quando.From(time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC))
|
||||||
|
// q := date.Quarter() // 1 (Q1)
|
||||||
|
func (d Date) Quarter() int {
|
||||||
|
month := d.t.Month()
|
||||||
|
switch {
|
||||||
|
case month >= 1 && month <= 3:
|
||||||
|
return 1
|
||||||
|
case month >= 4 && month <= 6:
|
||||||
|
return 2
|
||||||
|
case month >= 7 && month <= 9:
|
||||||
|
return 3
|
||||||
|
default: // month >= 10 && month <= 12
|
||||||
|
return 4
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// DayOfYear returns the day of the year (1-366).
|
||||||
|
// Also known as "ordinal date" or "Julian day number".
|
||||||
|
//
|
||||||
|
// January 1 = 1, December 31 = 365 (or 366 in leap years)
|
||||||
|
//
|
||||||
|
// Performance: < 1 µs, zero allocations
|
||||||
|
//
|
||||||
|
// Example:
|
||||||
|
//
|
||||||
|
// date := quando.From(time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC))
|
||||||
|
// day := date.DayOfYear() // 40 (Feb 9)
|
||||||
|
func (d Date) DayOfYear() int {
|
||||||
|
return d.t.YearDay()
|
||||||
|
}
|
||||||
|
|
||||||
|
// IsWeekend returns true if the date falls on a weekend (Saturday or Sunday).
|
||||||
|
//
|
||||||
|
// Note: This uses the ISO convention where Saturday and Sunday are considered
|
||||||
|
// weekend days. This is not configurable in Phase 1.
|
||||||
|
//
|
||||||
|
// Performance: < 1 µs, zero allocations
|
||||||
|
//
|
||||||
|
// Example:
|
||||||
|
//
|
||||||
|
// date := quando.From(time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC)) // Monday
|
||||||
|
// isWeekend := date.IsWeekend() // false
|
||||||
|
func (d Date) IsWeekend() bool {
|
||||||
|
weekday := d.t.Weekday()
|
||||||
|
return weekday == time.Saturday || weekday == time.Sunday
|
||||||
|
}
|
||||||
|
|
||||||
|
// IsLeapYear returns true if the date's year is a leap year.
|
||||||
|
//
|
||||||
|
// Leap year rules:
|
||||||
|
// - Divisible by 4: leap year (e.g., 2024)
|
||||||
|
// - EXCEPT divisible by 100: not a leap year (e.g., 1900, 2100)
|
||||||
|
// - EXCEPT divisible by 400: leap year (e.g., 2000, 2400)
|
||||||
|
//
|
||||||
|
// Performance: < 1 µs, zero allocations
|
||||||
|
//
|
||||||
|
// Example:
|
||||||
|
//
|
||||||
|
// date := quando.From(time.Date(2024, 2, 9, 0, 0, 0, 0, time.UTC))
|
||||||
|
// isLeap := date.IsLeapYear() // true (2024 is a leap year)
|
||||||
|
func (d Date) IsLeapYear() bool {
|
||||||
|
year := d.t.Year()
|
||||||
|
|
||||||
|
// Apply leap year rules
|
||||||
|
if year%400 == 0 {
|
||||||
|
return true // Divisible by 400: leap year
|
||||||
|
}
|
||||||
|
if year%100 == 0 {
|
||||||
|
return false // Divisible by 100 but not 400: not leap year
|
||||||
|
}
|
||||||
|
if year%4 == 0 {
|
||||||
|
return true // Divisible by 4 but not 100: leap year
|
||||||
|
}
|
||||||
|
return false // Not divisible by 4: not leap year
|
||||||
|
}
|
||||||
|
|
||||||
|
// Info returns aggregated metadata about the date.
|
||||||
|
//
|
||||||
|
// This is a convenience method that calls all inspection methods
|
||||||
|
// and packages the results into a single struct.
|
||||||
|
//
|
||||||
|
// Performance: < 1 µs (sum of all individual methods)
|
||||||
|
//
|
||||||
|
// Example:
|
||||||
|
//
|
||||||
|
// date := quando.From(time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC))
|
||||||
|
// info := date.Info()
|
||||||
|
// fmt.Printf("Week: %d, Quarter: %d\n", info.WeekNumber, info.Quarter)
|
||||||
|
func (d Date) Info() DateInfo {
|
||||||
|
return DateInfo{
|
||||||
|
WeekNumber: d.WeekNumber(),
|
||||||
|
Quarter: d.Quarter(),
|
||||||
|
DayOfYear: d.DayOfYear(),
|
||||||
|
IsWeekend: d.IsWeekend(),
|
||||||
|
IsLeapYear: d.IsLeapYear(),
|
||||||
|
Unix: d.Unix(),
|
||||||
|
}
|
||||||
|
}
|
||||||
441
inspect_test.go
Normal file
441
inspect_test.go
Normal file
|
|
@ -0,0 +1,441 @@
|
||||||
|
package quando
|
||||||
|
|
||||||
|
import (
|
||||||
|
"testing"
|
||||||
|
"time"
|
||||||
|
)
|
||||||
|
|
||||||
|
func TestWeekNumber(t *testing.T) {
|
||||||
|
tests := []struct {
|
||||||
|
name string
|
||||||
|
date time.Time
|
||||||
|
want int
|
||||||
|
}{
|
||||||
|
// Test all 7 days of week 7 in 2026 (Feb 9-15)
|
||||||
|
{
|
||||||
|
name: "2026-02-09 Monday week 7",
|
||||||
|
date: time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 7,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2026-02-10 Tuesday week 7",
|
||||||
|
date: time.Date(2026, 2, 10, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 7,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2026-02-11 Wednesday week 7",
|
||||||
|
date: time.Date(2026, 2, 11, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 7,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2026-02-12 Thursday week 7",
|
||||||
|
date: time.Date(2026, 2, 12, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 7,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2026-02-13 Friday week 7",
|
||||||
|
date: time.Date(2026, 2, 13, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 7,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2026-02-14 Saturday week 7",
|
||||||
|
date: time.Date(2026, 2, 14, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 7,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2026-02-15 Sunday week 7",
|
||||||
|
date: time.Date(2026, 2, 15, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 7,
|
||||||
|
},
|
||||||
|
|
||||||
|
// Year boundary cases
|
||||||
|
{
|
||||||
|
name: "2023-01-01 Sunday belongs to 2022 week 52",
|
||||||
|
date: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 52,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2023-01-02 Monday is week 1 of 2023",
|
||||||
|
date: time.Date(2023, 1, 2, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 1,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2024-01-01 Monday is week 1",
|
||||||
|
date: time.Date(2024, 1, 1, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 1,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2025-01-01 Wednesday is week 1",
|
||||||
|
date: time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 1,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2026-01-01 Thursday is week 1",
|
||||||
|
date: time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 1,
|
||||||
|
},
|
||||||
|
|
||||||
|
// Week 53 scenarios
|
||||||
|
{
|
||||||
|
name: "2020-12-31 Thursday is week 53",
|
||||||
|
date: time.Date(2020, 12, 31, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 53,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2026-12-31 Thursday is week 53",
|
||||||
|
date: time.Date(2026, 12, 31, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 53,
|
||||||
|
},
|
||||||
|
|
||||||
|
// Mid-year dates with known week numbers
|
||||||
|
{
|
||||||
|
name: "2026-06-15 Monday is week 25",
|
||||||
|
date: time.Date(2026, 6, 15, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 25,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2026-12-28 Monday is week 53",
|
||||||
|
date: time.Date(2026, 12, 28, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: 53,
|
||||||
|
},
|
||||||
|
}
|
||||||
|
|
||||||
|
for _, tt := range tests {
|
||||||
|
t.Run(tt.name, func(t *testing.T) {
|
||||||
|
d := From(tt.date)
|
||||||
|
got := d.WeekNumber()
|
||||||
|
if got != tt.want {
|
||||||
|
t.Errorf("WeekNumber() = %d, want %d", got, tt.want)
|
||||||
|
}
|
||||||
|
})
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestQuarter(t *testing.T) {
|
||||||
|
tests := []struct {
|
||||||
|
name string
|
||||||
|
date time.Time
|
||||||
|
want int
|
||||||
|
}{
|
||||||
|
// Test all 12 months
|
||||||
|
{"January Q1", time.Date(2026, 1, 15, 0, 0, 0, 0, time.UTC), 1},
|
||||||
|
{"February Q1", time.Date(2026, 2, 15, 0, 0, 0, 0, time.UTC), 1},
|
||||||
|
{"March Q1", time.Date(2026, 3, 15, 0, 0, 0, 0, time.UTC), 1},
|
||||||
|
{"April Q2", time.Date(2026, 4, 15, 0, 0, 0, 0, time.UTC), 2},
|
||||||
|
{"May Q2", time.Date(2026, 5, 15, 0, 0, 0, 0, time.UTC), 2},
|
||||||
|
{"June Q2", time.Date(2026, 6, 15, 0, 0, 0, 0, time.UTC), 2},
|
||||||
|
{"July Q3", time.Date(2026, 7, 15, 0, 0, 0, 0, time.UTC), 3},
|
||||||
|
{"August Q3", time.Date(2026, 8, 15, 0, 0, 0, 0, time.UTC), 3},
|
||||||
|
{"September Q3", time.Date(2026, 9, 15, 0, 0, 0, 0, time.UTC), 3},
|
||||||
|
{"October Q4", time.Date(2026, 10, 15, 0, 0, 0, 0, time.UTC), 4},
|
||||||
|
{"November Q4", time.Date(2026, 11, 15, 0, 0, 0, 0, time.UTC), 4},
|
||||||
|
{"December Q4", time.Date(2026, 12, 15, 0, 0, 0, 0, time.UTC), 4},
|
||||||
|
|
||||||
|
// Quarter boundaries
|
||||||
|
{"March 31 last day of Q1", time.Date(2026, 3, 31, 0, 0, 0, 0, time.UTC), 1},
|
||||||
|
{"April 1 first day of Q2", time.Date(2026, 4, 1, 0, 0, 0, 0, time.UTC), 2},
|
||||||
|
{"June 30 last day of Q2", time.Date(2026, 6, 30, 0, 0, 0, 0, time.UTC), 2},
|
||||||
|
{"July 1 first day of Q3", time.Date(2026, 7, 1, 0, 0, 0, 0, time.UTC), 3},
|
||||||
|
{"September 30 last day of Q3", time.Date(2026, 9, 30, 0, 0, 0, 0, time.UTC), 3},
|
||||||
|
{"October 1 first day of Q4", time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC), 4},
|
||||||
|
{"December 31 last day of Q4", time.Date(2026, 12, 31, 0, 0, 0, 0, time.UTC), 4},
|
||||||
|
|
||||||
|
// Leap year Feb 29
|
||||||
|
{"Feb 29 leap year Q1", time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC), 1},
|
||||||
|
}
|
||||||
|
|
||||||
|
for _, tt := range tests {
|
||||||
|
t.Run(tt.name, func(t *testing.T) {
|
||||||
|
d := From(tt.date)
|
||||||
|
got := d.Quarter()
|
||||||
|
if got != tt.want {
|
||||||
|
t.Errorf("Quarter() = %d, want %d", got, tt.want)
|
||||||
|
}
|
||||||
|
})
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestDayOfYear(t *testing.T) {
|
||||||
|
tests := []struct {
|
||||||
|
name string
|
||||||
|
date time.Time
|
||||||
|
want int
|
||||||
|
}{
|
||||||
|
// Jan 1 is always day 1
|
||||||
|
{"Jan 1 is day 1", time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC), 1},
|
||||||
|
|
||||||
|
// Dec 31 in non-leap year is day 365
|
||||||
|
{"Dec 31 non-leap year is 365", time.Date(2026, 12, 31, 0, 0, 0, 0, time.UTC), 365},
|
||||||
|
{"Dec 31 2025 is 365", time.Date(2025, 12, 31, 0, 0, 0, 0, time.UTC), 365},
|
||||||
|
|
||||||
|
// Dec 31 in leap year is day 366
|
||||||
|
{"Dec 31 leap year is 366", time.Date(2024, 12, 31, 0, 0, 0, 0, time.UTC), 366},
|
||||||
|
{"Dec 31 2020 is 366", time.Date(2020, 12, 31, 0, 0, 0, 0, time.UTC), 366},
|
||||||
|
|
||||||
|
// Feb 29 in leap year is day 60
|
||||||
|
{"Feb 29 leap year is 60", time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC), 60},
|
||||||
|
{"Feb 29 2020 is 60", time.Date(2020, 2, 29, 0, 0, 0, 0, time.UTC), 60},
|
||||||
|
|
||||||
|
// Random dates with known values
|
||||||
|
{"Feb 9 2026 is 40", time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC), 40},
|
||||||
|
{"Mar 1 2026 is 60", time.Date(2026, 3, 1, 0, 0, 0, 0, time.UTC), 60},
|
||||||
|
{"Mar 1 2024 leap year is 61", time.Date(2024, 3, 1, 0, 0, 0, 0, time.UTC), 61},
|
||||||
|
{"Jun 15 2026 is 166", time.Date(2026, 6, 15, 0, 0, 0, 0, time.UTC), 166},
|
||||||
|
{"Dec 25 2026 is 359", time.Date(2026, 12, 25, 0, 0, 0, 0, time.UTC), 359},
|
||||||
|
}
|
||||||
|
|
||||||
|
for _, tt := range tests {
|
||||||
|
t.Run(tt.name, func(t *testing.T) {
|
||||||
|
d := From(tt.date)
|
||||||
|
got := d.DayOfYear()
|
||||||
|
if got != tt.want {
|
||||||
|
t.Errorf("DayOfYear() = %d, want %d", got, tt.want)
|
||||||
|
}
|
||||||
|
})
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestIsWeekend(t *testing.T) {
|
||||||
|
tests := []struct {
|
||||||
|
name string
|
||||||
|
date time.Time
|
||||||
|
want bool
|
||||||
|
}{
|
||||||
|
// Test all 7 weekdays (Feb 9-15, 2026)
|
||||||
|
{"Monday not weekend", time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC), false},
|
||||||
|
{"Tuesday not weekend", time.Date(2026, 2, 10, 0, 0, 0, 0, time.UTC), false},
|
||||||
|
{"Wednesday not weekend", time.Date(2026, 2, 11, 0, 0, 0, 0, time.UTC), false},
|
||||||
|
{"Thursday not weekend", time.Date(2026, 2, 12, 0, 0, 0, 0, time.UTC), false},
|
||||||
|
{"Friday not weekend", time.Date(2026, 2, 13, 0, 0, 0, 0, time.UTC), false},
|
||||||
|
{"Saturday is weekend", time.Date(2026, 2, 14, 0, 0, 0, 0, time.UTC), true},
|
||||||
|
{"Sunday is weekend", time.Date(2026, 2, 15, 0, 0, 0, 0, time.UTC), true},
|
||||||
|
|
||||||
|
// Year boundaries on weekends
|
||||||
|
{"Jan 1 2023 Sunday is weekend", time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC), true},
|
||||||
|
{"Dec 31 2022 Saturday is weekend", time.Date(2022, 12, 31, 0, 0, 0, 0, time.UTC), true},
|
||||||
|
{"Jan 1 2024 Monday not weekend", time.Date(2024, 1, 1, 0, 0, 0, 0, time.UTC), false},
|
||||||
|
{"Dec 31 2024 Tuesday not weekend", time.Date(2024, 12, 31, 0, 0, 0, 0, time.UTC), false},
|
||||||
|
}
|
||||||
|
|
||||||
|
for _, tt := range tests {
|
||||||
|
t.Run(tt.name, func(t *testing.T) {
|
||||||
|
d := From(tt.date)
|
||||||
|
got := d.IsWeekend()
|
||||||
|
if got != tt.want {
|
||||||
|
t.Errorf("IsWeekend() = %v, want %v", got, tt.want)
|
||||||
|
}
|
||||||
|
})
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestIsLeapYear(t *testing.T) {
|
||||||
|
tests := []struct {
|
||||||
|
name string
|
||||||
|
year int
|
||||||
|
want bool
|
||||||
|
}{
|
||||||
|
// Regular leap years (divisible by 4, not by 100)
|
||||||
|
{"2024 is leap year", 2024, true},
|
||||||
|
{"2020 is leap year", 2020, true},
|
||||||
|
{"2028 is leap year", 2028, true},
|
||||||
|
{"2004 is leap year", 2004, true},
|
||||||
|
|
||||||
|
// Non-leap years
|
||||||
|
{"2026 not leap year", 2026, false},
|
||||||
|
{"2025 not leap year", 2025, false},
|
||||||
|
{"2023 not leap year", 2023, false},
|
||||||
|
{"2001 not leap year", 2001, false},
|
||||||
|
|
||||||
|
// Century rules (divisible by 100 but not 400)
|
||||||
|
{"1900 not leap year (century)", 1900, false},
|
||||||
|
{"2100 not leap year (century)", 2100, false},
|
||||||
|
{"2200 not leap year (century)", 2200, false},
|
||||||
|
{"2300 not leap year (century)", 2300, false},
|
||||||
|
|
||||||
|
// Century rules (divisible by 400)
|
||||||
|
{"2000 is leap year (400 rule)", 2000, true},
|
||||||
|
{"2400 is leap year (400 rule)", 2400, true},
|
||||||
|
{"1600 is leap year (400 rule)", 1600, true},
|
||||||
|
}
|
||||||
|
|
||||||
|
for _, tt := range tests {
|
||||||
|
t.Run(tt.name, func(t *testing.T) {
|
||||||
|
d := From(time.Date(tt.year, 1, 1, 0, 0, 0, 0, time.UTC))
|
||||||
|
got := d.IsLeapYear()
|
||||||
|
if got != tt.want {
|
||||||
|
t.Errorf("IsLeapYear() for year %d = %v, want %v", tt.year, got, tt.want)
|
||||||
|
}
|
||||||
|
})
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestInfo(t *testing.T) {
|
||||||
|
tests := []struct {
|
||||||
|
name string
|
||||||
|
date time.Time
|
||||||
|
want DateInfo
|
||||||
|
}{
|
||||||
|
{
|
||||||
|
name: "2026-02-09 Monday",
|
||||||
|
date: time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC),
|
||||||
|
want: DateInfo{
|
||||||
|
WeekNumber: 7,
|
||||||
|
Quarter: 1,
|
||||||
|
DayOfYear: 40,
|
||||||
|
IsWeekend: false,
|
||||||
|
IsLeapYear: false,
|
||||||
|
Unix: time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC).Unix(),
|
||||||
|
},
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2024-02-29 leap year Thursday",
|
||||||
|
date: time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: DateInfo{
|
||||||
|
WeekNumber: 9,
|
||||||
|
Quarter: 1,
|
||||||
|
DayOfYear: 60,
|
||||||
|
IsWeekend: false,
|
||||||
|
IsLeapYear: true,
|
||||||
|
Unix: time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC).Unix(),
|
||||||
|
},
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2026-12-31 Thursday week 53",
|
||||||
|
date: time.Date(2026, 12, 31, 23, 59, 59, 0, time.UTC),
|
||||||
|
want: DateInfo{
|
||||||
|
WeekNumber: 53,
|
||||||
|
Quarter: 4,
|
||||||
|
DayOfYear: 365,
|
||||||
|
IsWeekend: false,
|
||||||
|
IsLeapYear: false,
|
||||||
|
Unix: time.Date(2026, 12, 31, 23, 59, 59, 0, time.UTC).Unix(),
|
||||||
|
},
|
||||||
|
},
|
||||||
|
{
|
||||||
|
name: "2026-06-14 Sunday weekend Q2",
|
||||||
|
date: time.Date(2026, 6, 14, 0, 0, 0, 0, time.UTC),
|
||||||
|
want: DateInfo{
|
||||||
|
WeekNumber: 24,
|
||||||
|
Quarter: 2,
|
||||||
|
DayOfYear: 165,
|
||||||
|
IsWeekend: true,
|
||||||
|
IsLeapYear: false,
|
||||||
|
Unix: time.Date(2026, 6, 14, 0, 0, 0, 0, time.UTC).Unix(),
|
||||||
|
},
|
||||||
|
},
|
||||||
|
}
|
||||||
|
|
||||||
|
for _, tt := range tests {
|
||||||
|
t.Run(tt.name, func(t *testing.T) {
|
||||||
|
d := From(tt.date)
|
||||||
|
got := d.Info()
|
||||||
|
|
||||||
|
if got.WeekNumber != tt.want.WeekNumber {
|
||||||
|
t.Errorf("Info().WeekNumber = %d, want %d", got.WeekNumber, tt.want.WeekNumber)
|
||||||
|
}
|
||||||
|
if got.Quarter != tt.want.Quarter {
|
||||||
|
t.Errorf("Info().Quarter = %d, want %d", got.Quarter, tt.want.Quarter)
|
||||||
|
}
|
||||||
|
if got.DayOfYear != tt.want.DayOfYear {
|
||||||
|
t.Errorf("Info().DayOfYear = %d, want %d", got.DayOfYear, tt.want.DayOfYear)
|
||||||
|
}
|
||||||
|
if got.IsWeekend != tt.want.IsWeekend {
|
||||||
|
t.Errorf("Info().IsWeekend = %v, want %v", got.IsWeekend, tt.want.IsWeekend)
|
||||||
|
}
|
||||||
|
if got.IsLeapYear != tt.want.IsLeapYear {
|
||||||
|
t.Errorf("Info().IsLeapYear = %v, want %v", got.IsLeapYear, tt.want.IsLeapYear)
|
||||||
|
}
|
||||||
|
if got.Unix != tt.want.Unix {
|
||||||
|
t.Errorf("Info().Unix = %d, want %d", got.Unix, tt.want.Unix)
|
||||||
|
}
|
||||||
|
})
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// TestInfo_ConsistentWithIndividualMethods verifies that Info() returns
|
||||||
|
// the same values as calling each method individually
|
||||||
|
func TestInfo_ConsistentWithIndividualMethods(t *testing.T) {
|
||||||
|
dates := []time.Time{
|
||||||
|
time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC),
|
||||||
|
time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC),
|
||||||
|
time.Date(2026, 12, 31, 23, 59, 59, 0, time.UTC),
|
||||||
|
time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
|
||||||
|
time.Date(2020, 12, 31, 0, 0, 0, 0, time.UTC),
|
||||||
|
}
|
||||||
|
|
||||||
|
for _, date := range dates {
|
||||||
|
t.Run(date.Format("2006-01-02"), func(t *testing.T) {
|
||||||
|
d := From(date)
|
||||||
|
info := d.Info()
|
||||||
|
|
||||||
|
if info.WeekNumber != d.WeekNumber() {
|
||||||
|
t.Errorf("Info().WeekNumber inconsistent: got %d, individual method %d", info.WeekNumber, d.WeekNumber())
|
||||||
|
}
|
||||||
|
if info.Quarter != d.Quarter() {
|
||||||
|
t.Errorf("Info().Quarter inconsistent: got %d, individual method %d", info.Quarter, d.Quarter())
|
||||||
|
}
|
||||||
|
if info.DayOfYear != d.DayOfYear() {
|
||||||
|
t.Errorf("Info().DayOfYear inconsistent: got %d, individual method %d", info.DayOfYear, d.DayOfYear())
|
||||||
|
}
|
||||||
|
if info.IsWeekend != d.IsWeekend() {
|
||||||
|
t.Errorf("Info().IsWeekend inconsistent: got %v, individual method %v", info.IsWeekend, d.IsWeekend())
|
||||||
|
}
|
||||||
|
if info.IsLeapYear != d.IsLeapYear() {
|
||||||
|
t.Errorf("Info().IsLeapYear inconsistent: got %v, individual method %v", info.IsLeapYear, d.IsLeapYear())
|
||||||
|
}
|
||||||
|
if info.Unix != d.Unix() {
|
||||||
|
t.Errorf("Info().Unix inconsistent: got %d, individual method %d", info.Unix, d.Unix())
|
||||||
|
}
|
||||||
|
})
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Benchmarks
|
||||||
|
|
||||||
|
func BenchmarkWeekNumber(b *testing.B) {
|
||||||
|
d := From(time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC))
|
||||||
|
b.ResetTimer()
|
||||||
|
for i := 0; i < b.N; i++ {
|
||||||
|
_ = d.WeekNumber()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func BenchmarkQuarter(b *testing.B) {
|
||||||
|
d := From(time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC))
|
||||||
|
b.ResetTimer()
|
||||||
|
for i := 0; i < b.N; i++ {
|
||||||
|
_ = d.Quarter()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func BenchmarkDayOfYear(b *testing.B) {
|
||||||
|
d := From(time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC))
|
||||||
|
b.ResetTimer()
|
||||||
|
for i := 0; i < b.N; i++ {
|
||||||
|
_ = d.DayOfYear()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func BenchmarkIsWeekend(b *testing.B) {
|
||||||
|
d := From(time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC))
|
||||||
|
b.ResetTimer()
|
||||||
|
for i := 0; i < b.N; i++ {
|
||||||
|
_ = d.IsWeekend()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func BenchmarkIsLeapYear(b *testing.B) {
|
||||||
|
d := From(time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC))
|
||||||
|
b.ResetTimer()
|
||||||
|
for i := 0; i < b.N; i++ {
|
||||||
|
_ = d.IsLeapYear()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func BenchmarkInfo(b *testing.B) {
|
||||||
|
d := From(time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC))
|
||||||
|
b.ResetTimer()
|
||||||
|
for i := 0; i < b.N; i++ {
|
||||||
|
_ = d.Info()
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Add table
Add a link
Reference in a new issue