22 lines
634 B
Go
22 lines
634 B
Go
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package tools
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import "time"
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func FirstDayOfISOWeek(year int, week int, timezone *time.Location) time.Time {
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date := time.Date(year, 0, 0, 0, 0, 0, 0, timezone)
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isoYear, isoWeek := date.ISOWeek()
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for date.Weekday() != time.Monday { // iterate back to Monday
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date = date.AddDate(0, 0, -1)
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isoYear, isoWeek = date.ISOWeek()
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}
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for isoYear < year { // iterate forward to the first day of the first week
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date = date.AddDate(0, 0, 1)
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isoYear, isoWeek = date.ISOWeek()
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}
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for isoWeek < week { // iterate forward to the first day of the given week
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date = date.AddDate(0, 0, 1)
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_, isoWeek = date.ISOWeek()
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}
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return date
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}
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