37 lines
1.2 KiB
Go
37 lines
1.2 KiB
Go
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package civiltime
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import "time"
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// Event 合并变长民用日的固定偏移候选，handled=false 表示普通日期 / merges fixed-offset candidates on a civil day with an offset change.
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func Event(date time.Time, missing error, calculate func(time.Time) (time.Time, error)) (result time.Time, err error, handled bool) {
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year, month, day := date.Date()
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start := time.Date(year, month, day, 0, 0, 0, 0, date.Location())
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end := time.Date(year, month, day+1, 0, 0, 0, 0, date.Location())
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_, firstOffset := start.Zone()
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_, lastOffset := end.Add(-time.Nanosecond).Zone()
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if firstOffset == lastOffset {
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return time.Time{}, nil, false
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}
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var firstErr error
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for _, offset := range []int{firstOffset, lastOffset} {
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fixed := time.Date(year, month, day, 0, 0, 0, 0, time.FixedZone("", offset))
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candidate, candidateErr := calculate(fixed)
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if candidateErr != nil {
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if firstErr == nil {
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firstErr = candidateErr
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}
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continue
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}
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if !candidate.Before(start) && candidate.Before(end) && (result.IsZero() || candidate.Before(result)) {
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result = candidate.In(date.Location())
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}
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}
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if !result.IsZero() {
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return result, nil, true
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}
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if firstErr != nil {
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return time.Time{}, firstErr, true
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}
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return time.Time{}, missing, true
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}
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