feat(quando-gr5): implement automatic date parsing with format detection
Implement Parse() function that automatically detects and parses common date formats without requiring explicit layout strings. This provides an intuitive API for parsing dates from various sources while maintaining type safety through proper error handling. Supported formats: - ISO format (YYYY-MM-DD): "2026-02-09" - ISO with slash (YYYY/MM/DD): "2026/02/09" - EU format (DD.MM.YYYY): "09.02.2026" - RFC2822/RFC1123: "Mon, 09 Feb 2026 00:00:00 +0000" Key features: - Detects and rejects ambiguous slash formats (e.g., "01/02/2026") - Returns clear, contextual errors for invalid or ambiguous inputs - Never panics - all errors via return values - Zero allocations for successful parses - Comprehensive test coverage (98%) Performance results: - ISO format: 105.5 ns/op (94x faster than 10µs target) - ISO slash: 118.3 ns/op - EU format: 117.4 ns/op - RFC2822: 257.8 ns/op Test coverage: - 42 unit tests covering valid formats, error cases, edge cases - 3 example tests demonstrating usage patterns - Benchmarks for all format types - Parse() function: 100% coverage Files added: - parse.go: Main implementation with Parse() and helper functions - parse_test.go: Comprehensive test suite with table-driven tests Files modified: - example_test.go: Added ExampleParse examples
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267
parse_test.go
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267
parse_test.go
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package quando
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import (
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"errors"
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"testing"
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"time"
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)
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func TestParse(t *testing.T) {
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tests := []struct {
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name string
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input string
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expected time.Time
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}{
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// ISO format (YYYY-MM-DD)
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{"ISO: basic date", "2026-02-09", time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC)},
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{"ISO: year end", "2024-12-31", time.Date(2024, 12, 31, 0, 0, 0, 0, time.UTC)},
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{"ISO: year start", "2020-01-01", time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC)},
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{"ISO: leap year", "2024-02-29", time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC)},
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{"ISO: month boundary", "2026-06-30", time.Date(2026, 6, 30, 0, 0, 0, 0, time.UTC)},
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// ISO with slash (YYYY/MM/DD)
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{"ISO slash: basic date", "2026/02/09", time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC)},
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{"ISO slash: year end", "2024/12/31", time.Date(2024, 12, 31, 0, 0, 0, 0, time.UTC)},
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{"ISO slash: year start", "2020/01/01", time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC)},
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{"ISO slash: leap year", "2024/02/29", time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC)},
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// EU format (DD.MM.YYYY)
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{"EU: basic date", "09.02.2026", time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC)},
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{"EU: year end", "31.12.2024", time.Date(2024, 12, 31, 0, 0, 0, 0, time.UTC)},
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{"EU: year start", "01.01.2020", time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC)},
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{"EU: leap year", "29.02.2024", time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC)},
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{"EU: month boundary", "30.06.2026", time.Date(2026, 6, 30, 0, 0, 0, 0, time.UTC)},
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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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result, err := Parse(tt.input)
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if err != nil {
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t.Fatalf("Parse(%q) unexpected error: %v", tt.input, err)
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}
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// Compare the time values
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if !result.Time().Equal(tt.expected) {
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t.Errorf("Parse(%q) = %v, want %v", tt.input, result.Time(), tt.expected)
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}
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// Verify default language is EN
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if result.lang != EN {
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t.Errorf("Parse(%q) lang = %v, want %v", tt.input, result.lang, EN)
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}
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})
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}
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}
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func TestParseErrors(t *testing.T) {
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tests := []struct {
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name string
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input string
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wantError bool
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checkMsg string // substring to check in error message
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}{
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// Ambiguous formats
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{"ambiguous: 01/02/2026", "01/02/2026", true, "ambiguous"},
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{"ambiguous: 31/12/2024", "31/12/2024", true, "ambiguous"},
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{"ambiguous: 15/06/2025", "15/06/2025", true, "ambiguous"},
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{"ambiguous: 01/01/2020", "01/01/2020", true, "ambiguous"},
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// Invalid formats
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{"invalid: not a date", "not-a-date", true, ""},
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{"invalid: empty string", "", true, "empty"},
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{"invalid: only whitespace", " ", true, ""},
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{"invalid: incomplete date", "2026-02", true, ""},
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{"invalid: wrong separator", "2026_02_09", true, ""},
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{"invalid: extra characters", "2026-02-09 extra", true, ""},
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// Invalid date components
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{"invalid: month 13", "2026-13-01", true, ""},
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{"invalid: month 00", "2026-00-01", true, ""},
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{"invalid: day 00", "2026-02-00", true, ""},
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{"invalid: day 32", "2026-01-32", true, ""},
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{"invalid: Feb 30", "2026-02-30", true, ""},
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{"invalid: non-leap year Feb 29", "2023-02-29", true, ""},
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{"invalid: April 31", "2026-04-31", true, ""},
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// EU format invalid dates
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{"invalid EU: Feb 30", "30.02.2026", true, ""},
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{"invalid EU: month 13", "01.13.2026", true, ""},
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// Edge cases
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{"invalid: just numbers", "20260209", true, ""},
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{"invalid: wrong length", "26-02-09", true, ""},
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{"invalid: mixed separators", "2026-02/09", 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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result, err := Parse(tt.input)
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if tt.wantError {
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if err == nil {
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t.Fatalf("Parse(%q) expected error, got nil (result: %v)", tt.input, result)
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}
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// Verify it's the right error type
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if !errors.Is(err, ErrInvalidFormat) {
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t.Errorf("Parse(%q) error = %v, want error wrapping ErrInvalidFormat", tt.input, err)
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}
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// Check for specific message substring if provided
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if tt.checkMsg != "" && !containsSubstring(err.Error(), tt.checkMsg) {
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t.Errorf("Parse(%q) error message %q does not contain %q", tt.input, err.Error(), tt.checkMsg)
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}
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} else {
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if err != nil {
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t.Fatalf("Parse(%q) unexpected error: %v", tt.input, err)
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}
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}
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})
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}
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}
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func TestParseRFC2822(t *testing.T) {
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tests := []struct {
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name string
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input string
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expected time.Time
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}{
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{
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"RFC2822: basic",
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"Mon, 09 Feb 2026 00:00:00 +0000",
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time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC),
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},
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{
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"RFC2822: with time",
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"Mon, 09 Feb 2026 15:30:45 +0000",
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time.Date(2026, 2, 9, 15, 30, 45, 0, time.UTC),
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},
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{
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"RFC1123: different month",
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"Fri, 31 Dec 2024 23:59:59 GMT",
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time.Date(2024, 12, 31, 23, 59, 59, 0, time.UTC),
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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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result, err := Parse(tt.input)
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if err != nil {
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t.Fatalf("Parse(%q) unexpected error: %v", tt.input, err)
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}
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if !result.Time().Equal(tt.expected) {
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t.Errorf("Parse(%q) = %v, want %v", tt.input, result.Time(), tt.expected)
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}
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})
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}
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}
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func TestParseImmutability(t *testing.T) {
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input := "2026-02-09"
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// Parse twice
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date1, err1 := Parse(input)
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date2, err2 := Parse(input)
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if err1 != nil || err2 != nil {
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t.Fatalf("Parse(%q) unexpected errors: %v, %v", input, err1, err2)
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}
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// Verify they're equal
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if !date1.Time().Equal(date2.Time()) {
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t.Errorf("Parse(%q) produced different results: %v vs %v", input, date1, date2)
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}
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// Modify date1 by adding time
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modified := date1.Add(1, Days)
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// Verify original is unchanged
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if !date1.Time().Equal(date2.Time()) {
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t.Errorf("Modifying result of Parse affected original date")
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}
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// Verify modification worked
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expected := date1.Time().AddDate(0, 0, 1)
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if !modified.Time().Equal(expected) {
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t.Errorf("Add operation failed: got %v, want %v", modified.Time(), expected)
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}
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}
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func TestParseWhitespace(t *testing.T) {
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tests := []struct {
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name string
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input string
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expected time.Time
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}{
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{"leading whitespace", " 2026-02-09", time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC)},
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{"trailing whitespace", "2026-02-09 ", time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC)},
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{"both whitespace", " 2026-02-09 ", time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC)},
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{"tab whitespace", "\t2026-02-09\t", time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC)},
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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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result, err := Parse(tt.input)
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if err != nil {
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t.Fatalf("Parse(%q) unexpected error: %v", tt.input, err)
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}
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if !result.Time().Equal(tt.expected) {
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t.Errorf("Parse(%q) = %v, want %v", tt.input, result.Time(), tt.expected)
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}
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})
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}
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}
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// BenchmarkParse benchmarks the Parse function with different formats
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func BenchmarkParse(b *testing.B) {
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benchmarks := []struct {
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name string
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input string
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}{
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{"ISO format", "2026-02-09"},
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{"ISO slash", "2026/02/09"},
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{"EU format", "09.02.2026"},
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{"RFC2822", "Mon, 09 Feb 2026 00:00:00 +0000"},
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}
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for _, bm := range benchmarks {
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b.Run(bm.name, func(b *testing.B) {
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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_, err := Parse(bm.input)
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if err != nil {
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b.Fatalf("Parse failed: %v", err)
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}
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}
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})
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}
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}
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// BenchmarkParseError benchmarks error case (ambiguous format)
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func BenchmarkParseError(b *testing.B) {
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input := "01/02/2026" // Ambiguous format
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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_, err := Parse(input)
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if err == nil {
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b.Fatal("Expected error for ambiguous format")
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}
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}
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}
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// containsSubstring is a helper function to check if a string contains a substring
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func containsSubstring(s, substr string) bool {
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return len(substr) == 0 || len(s) >= len(substr) && (s == substr || len(s) > len(substr) && containsSubstringHelper(s, substr))
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}
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func containsSubstringHelper(s, substr string) bool {
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for i := 0; i <= len(s)-len(substr); i++ {
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if s[i:i+len(substr)] == substr {
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return true
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}
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}
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return false
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}
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