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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4 changed files with 734 additions and 1 deletions
441
inspect_test.go
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441
inspect_test.go
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package quando
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import (
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"testing"
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"time"
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)
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func TestWeekNumber(t *testing.T) {
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tests := []struct {
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name string
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date time.Time
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want int
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}{
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// Test all 7 days of week 7 in 2026 (Feb 9-15)
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{
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name: "2026-02-09 Monday week 7",
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date: time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC),
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want: 7,
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},
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{
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name: "2026-02-10 Tuesday week 7",
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date: time.Date(2026, 2, 10, 0, 0, 0, 0, time.UTC),
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want: 7,
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},
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{
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name: "2026-02-11 Wednesday week 7",
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date: time.Date(2026, 2, 11, 0, 0, 0, 0, time.UTC),
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want: 7,
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},
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{
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name: "2026-02-12 Thursday week 7",
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date: time.Date(2026, 2, 12, 0, 0, 0, 0, time.UTC),
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want: 7,
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},
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{
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name: "2026-02-13 Friday week 7",
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date: time.Date(2026, 2, 13, 0, 0, 0, 0, time.UTC),
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want: 7,
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},
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{
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name: "2026-02-14 Saturday week 7",
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date: time.Date(2026, 2, 14, 0, 0, 0, 0, time.UTC),
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want: 7,
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},
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{
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name: "2026-02-15 Sunday week 7",
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date: time.Date(2026, 2, 15, 0, 0, 0, 0, time.UTC),
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want: 7,
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},
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// Year boundary cases
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{
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name: "2023-01-01 Sunday belongs to 2022 week 52",
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date: time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
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want: 52,
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},
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{
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name: "2023-01-02 Monday is week 1 of 2023",
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date: time.Date(2023, 1, 2, 0, 0, 0, 0, time.UTC),
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want: 1,
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},
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{
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name: "2024-01-01 Monday is week 1",
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date: time.Date(2024, 1, 1, 0, 0, 0, 0, time.UTC),
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want: 1,
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},
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{
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name: "2025-01-01 Wednesday is week 1",
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date: time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC),
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want: 1,
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},
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{
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name: "2026-01-01 Thursday is week 1",
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date: time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC),
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want: 1,
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},
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// Week 53 scenarios
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{
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name: "2020-12-31 Thursday is week 53",
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date: time.Date(2020, 12, 31, 0, 0, 0, 0, time.UTC),
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want: 53,
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},
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{
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name: "2026-12-31 Thursday is week 53",
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date: time.Date(2026, 12, 31, 0, 0, 0, 0, time.UTC),
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want: 53,
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},
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// Mid-year dates with known week numbers
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{
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name: "2026-06-15 Monday is week 25",
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date: time.Date(2026, 6, 15, 0, 0, 0, 0, time.UTC),
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want: 25,
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},
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{
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name: "2026-12-28 Monday is week 53",
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date: time.Date(2026, 12, 28, 0, 0, 0, 0, time.UTC),
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want: 53,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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d := From(tt.date)
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got := d.WeekNumber()
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if got != tt.want {
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t.Errorf("WeekNumber() = %d, want %d", got, tt.want)
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}
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})
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}
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}
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func TestQuarter(t *testing.T) {
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tests := []struct {
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name string
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date time.Time
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want int
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}{
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// Test all 12 months
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{"January Q1", time.Date(2026, 1, 15, 0, 0, 0, 0, time.UTC), 1},
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{"February Q1", time.Date(2026, 2, 15, 0, 0, 0, 0, time.UTC), 1},
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{"March Q1", time.Date(2026, 3, 15, 0, 0, 0, 0, time.UTC), 1},
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{"April Q2", time.Date(2026, 4, 15, 0, 0, 0, 0, time.UTC), 2},
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{"May Q2", time.Date(2026, 5, 15, 0, 0, 0, 0, time.UTC), 2},
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{"June Q2", time.Date(2026, 6, 15, 0, 0, 0, 0, time.UTC), 2},
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{"July Q3", time.Date(2026, 7, 15, 0, 0, 0, 0, time.UTC), 3},
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{"August Q3", time.Date(2026, 8, 15, 0, 0, 0, 0, time.UTC), 3},
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{"September Q3", time.Date(2026, 9, 15, 0, 0, 0, 0, time.UTC), 3},
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{"October Q4", time.Date(2026, 10, 15, 0, 0, 0, 0, time.UTC), 4},
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{"November Q4", time.Date(2026, 11, 15, 0, 0, 0, 0, time.UTC), 4},
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{"December Q4", time.Date(2026, 12, 15, 0, 0, 0, 0, time.UTC), 4},
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// Quarter boundaries
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{"March 31 last day of Q1", time.Date(2026, 3, 31, 0, 0, 0, 0, time.UTC), 1},
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{"April 1 first day of Q2", time.Date(2026, 4, 1, 0, 0, 0, 0, time.UTC), 2},
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{"June 30 last day of Q2", time.Date(2026, 6, 30, 0, 0, 0, 0, time.UTC), 2},
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{"July 1 first day of Q3", time.Date(2026, 7, 1, 0, 0, 0, 0, time.UTC), 3},
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{"September 30 last day of Q3", time.Date(2026, 9, 30, 0, 0, 0, 0, time.UTC), 3},
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{"October 1 first day of Q4", time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC), 4},
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{"December 31 last day of Q4", time.Date(2026, 12, 31, 0, 0, 0, 0, time.UTC), 4},
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// Leap year Feb 29
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{"Feb 29 leap year Q1", time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC), 1},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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d := From(tt.date)
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got := d.Quarter()
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if got != tt.want {
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t.Errorf("Quarter() = %d, want %d", got, tt.want)
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}
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})
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}
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}
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func TestDayOfYear(t *testing.T) {
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tests := []struct {
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name string
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date time.Time
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want int
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}{
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// Jan 1 is always day 1
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{"Jan 1 is day 1", time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC), 1},
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// Dec 31 in non-leap year is day 365
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{"Dec 31 non-leap year is 365", time.Date(2026, 12, 31, 0, 0, 0, 0, time.UTC), 365},
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{"Dec 31 2025 is 365", time.Date(2025, 12, 31, 0, 0, 0, 0, time.UTC), 365},
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// Dec 31 in leap year is day 366
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{"Dec 31 leap year is 366", time.Date(2024, 12, 31, 0, 0, 0, 0, time.UTC), 366},
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{"Dec 31 2020 is 366", time.Date(2020, 12, 31, 0, 0, 0, 0, time.UTC), 366},
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// Feb 29 in leap year is day 60
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{"Feb 29 leap year is 60", time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC), 60},
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{"Feb 29 2020 is 60", time.Date(2020, 2, 29, 0, 0, 0, 0, time.UTC), 60},
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// Random dates with known values
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{"Feb 9 2026 is 40", time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC), 40},
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{"Mar 1 2026 is 60", time.Date(2026, 3, 1, 0, 0, 0, 0, time.UTC), 60},
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{"Mar 1 2024 leap year is 61", time.Date(2024, 3, 1, 0, 0, 0, 0, time.UTC), 61},
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{"Jun 15 2026 is 166", time.Date(2026, 6, 15, 0, 0, 0, 0, time.UTC), 166},
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{"Dec 25 2026 is 359", time.Date(2026, 12, 25, 0, 0, 0, 0, time.UTC), 359},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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d := From(tt.date)
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got := d.DayOfYear()
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if got != tt.want {
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t.Errorf("DayOfYear() = %d, want %d", got, tt.want)
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}
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})
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}
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}
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func TestIsWeekend(t *testing.T) {
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tests := []struct {
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name string
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date time.Time
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want bool
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}{
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// Test all 7 weekdays (Feb 9-15, 2026)
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{"Monday not weekend", time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC), false},
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{"Tuesday not weekend", time.Date(2026, 2, 10, 0, 0, 0, 0, time.UTC), false},
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{"Wednesday not weekend", time.Date(2026, 2, 11, 0, 0, 0, 0, time.UTC), false},
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{"Thursday not weekend", time.Date(2026, 2, 12, 0, 0, 0, 0, time.UTC), false},
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{"Friday not weekend", time.Date(2026, 2, 13, 0, 0, 0, 0, time.UTC), false},
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{"Saturday is weekend", time.Date(2026, 2, 14, 0, 0, 0, 0, time.UTC), true},
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{"Sunday is weekend", time.Date(2026, 2, 15, 0, 0, 0, 0, time.UTC), true},
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// Year boundaries on weekends
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{"Jan 1 2023 Sunday is weekend", time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC), true},
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{"Dec 31 2022 Saturday is weekend", time.Date(2022, 12, 31, 0, 0, 0, 0, time.UTC), true},
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{"Jan 1 2024 Monday not weekend", time.Date(2024, 1, 1, 0, 0, 0, 0, time.UTC), false},
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{"Dec 31 2024 Tuesday not weekend", time.Date(2024, 12, 31, 0, 0, 0, 0, time.UTC), false},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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d := From(tt.date)
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got := d.IsWeekend()
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if got != tt.want {
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t.Errorf("IsWeekend() = %v, want %v", got, tt.want)
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}
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})
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}
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}
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func TestIsLeapYear(t *testing.T) {
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tests := []struct {
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name string
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year int
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want bool
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}{
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// Regular leap years (divisible by 4, not by 100)
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{"2024 is leap year", 2024, true},
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{"2020 is leap year", 2020, true},
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{"2028 is leap year", 2028, true},
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{"2004 is leap year", 2004, true},
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// Non-leap years
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{"2026 not leap year", 2026, false},
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{"2025 not leap year", 2025, false},
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{"2023 not leap year", 2023, false},
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{"2001 not leap year", 2001, false},
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// Century rules (divisible by 100 but not 400)
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{"1900 not leap year (century)", 1900, false},
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{"2100 not leap year (century)", 2100, false},
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{"2200 not leap year (century)", 2200, false},
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{"2300 not leap year (century)", 2300, false},
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// Century rules (divisible by 400)
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{"2000 is leap year (400 rule)", 2000, true},
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{"2400 is leap year (400 rule)", 2400, true},
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{"1600 is leap year (400 rule)", 1600, true},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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d := From(time.Date(tt.year, 1, 1, 0, 0, 0, 0, time.UTC))
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got := d.IsLeapYear()
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if got != tt.want {
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t.Errorf("IsLeapYear() for year %d = %v, want %v", tt.year, got, tt.want)
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}
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})
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}
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}
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func TestInfo(t *testing.T) {
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tests := []struct {
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name string
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date time.Time
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want DateInfo
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}{
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{
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name: "2026-02-09 Monday",
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date: time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC),
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want: DateInfo{
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WeekNumber: 7,
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Quarter: 1,
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DayOfYear: 40,
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IsWeekend: false,
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IsLeapYear: false,
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Unix: time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC).Unix(),
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},
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},
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{
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name: "2024-02-29 leap year Thursday",
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date: time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC),
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want: DateInfo{
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WeekNumber: 9,
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Quarter: 1,
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DayOfYear: 60,
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IsWeekend: false,
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IsLeapYear: true,
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Unix: time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC).Unix(),
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},
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},
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{
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name: "2026-12-31 Thursday week 53",
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date: time.Date(2026, 12, 31, 23, 59, 59, 0, time.UTC),
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want: DateInfo{
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WeekNumber: 53,
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Quarter: 4,
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DayOfYear: 365,
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IsWeekend: false,
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IsLeapYear: false,
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Unix: time.Date(2026, 12, 31, 23, 59, 59, 0, time.UTC).Unix(),
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},
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},
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{
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name: "2026-06-14 Sunday weekend Q2",
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date: time.Date(2026, 6, 14, 0, 0, 0, 0, time.UTC),
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want: DateInfo{
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WeekNumber: 24,
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Quarter: 2,
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DayOfYear: 165,
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IsWeekend: true,
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IsLeapYear: false,
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Unix: time.Date(2026, 6, 14, 0, 0, 0, 0, time.UTC).Unix(),
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},
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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d := From(tt.date)
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got := d.Info()
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if got.WeekNumber != tt.want.WeekNumber {
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t.Errorf("Info().WeekNumber = %d, want %d", got.WeekNumber, tt.want.WeekNumber)
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}
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if got.Quarter != tt.want.Quarter {
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t.Errorf("Info().Quarter = %d, want %d", got.Quarter, tt.want.Quarter)
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}
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if got.DayOfYear != tt.want.DayOfYear {
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t.Errorf("Info().DayOfYear = %d, want %d", got.DayOfYear, tt.want.DayOfYear)
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}
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if got.IsWeekend != tt.want.IsWeekend {
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t.Errorf("Info().IsWeekend = %v, want %v", got.IsWeekend, tt.want.IsWeekend)
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}
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if got.IsLeapYear != tt.want.IsLeapYear {
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t.Errorf("Info().IsLeapYear = %v, want %v", got.IsLeapYear, tt.want.IsLeapYear)
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}
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if got.Unix != tt.want.Unix {
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t.Errorf("Info().Unix = %d, want %d", got.Unix, tt.want.Unix)
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}
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})
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}
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}
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// TestInfo_ConsistentWithIndividualMethods verifies that Info() returns
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// the same values as calling each method individually
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func TestInfo_ConsistentWithIndividualMethods(t *testing.T) {
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dates := []time.Time{
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time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC),
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time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC),
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time.Date(2026, 12, 31, 23, 59, 59, 0, time.UTC),
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time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC),
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time.Date(2020, 12, 31, 0, 0, 0, 0, time.UTC),
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}
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for _, date := range dates {
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t.Run(date.Format("2006-01-02"), func(t *testing.T) {
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d := From(date)
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info := d.Info()
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if info.WeekNumber != d.WeekNumber() {
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t.Errorf("Info().WeekNumber inconsistent: got %d, individual method %d", info.WeekNumber, d.WeekNumber())
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}
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if info.Quarter != d.Quarter() {
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t.Errorf("Info().Quarter inconsistent: got %d, individual method %d", info.Quarter, d.Quarter())
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}
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if info.DayOfYear != d.DayOfYear() {
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t.Errorf("Info().DayOfYear inconsistent: got %d, individual method %d", info.DayOfYear, d.DayOfYear())
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}
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if info.IsWeekend != d.IsWeekend() {
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t.Errorf("Info().IsWeekend inconsistent: got %v, individual method %v", info.IsWeekend, d.IsWeekend())
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}
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if info.IsLeapYear != d.IsLeapYear() {
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t.Errorf("Info().IsLeapYear inconsistent: got %v, individual method %v", info.IsLeapYear, d.IsLeapYear())
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}
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if info.Unix != d.Unix() {
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t.Errorf("Info().Unix inconsistent: got %d, individual method %d", info.Unix, d.Unix())
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}
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})
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}
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}
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// Benchmarks
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func BenchmarkWeekNumber(b *testing.B) {
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d := From(time.Date(2026, 2, 9, 12, 30, 45, 0, time.UTC))
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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||||
_ = 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