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golang 通过ISOWeek翻转得到周的日期时间
func firstDayOfISOWeek(year int, week int, timezone *time.Location) time.Time {
date := time.Date(year, 0, 0, 0, 0, 0, 0, timezone)
isoYear, isoWeek := date.ISOWeek()
for date.Weekday() != time.Monday { // iterate back to Monday
date = date.AddDate(0, 0, -1)
isoYear, isoWeek = date.ISOWeek()
}
for isoYear < year { // iterate forward to the first day of the first week
date = date.AddDate(0, 0, 1)
isoYear, isoWeek = date.ISOWeek()
}
for isoWeek < week { // iterate forward to the first day of the given week
date = date.AddDate(0, 0, 1)
isoYear, isoWeek = date.ISOWeek()
}
return date
}
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