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wakapi/utils/date.go

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2019-05-19 21:06:07 +03:00
package utils
import "time"
func StartOfDay() time.Time {
ref := time.Now()
return time.Date(ref.Year(), ref.Month(), ref.Day(), 0, 0, 0, 0, ref.Location())
}
func StartOfWeek() time.Time {
ref := time.Now()
year, week := ref.ISOWeek()
return firstDayOfISOWeek(year, week, ref.Location())
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}
func StartOfMonth() time.Time {
ref := time.Now()
return time.Date(ref.Year(), ref.Month(), 1, 0, 0, 0, 0, ref.Location())
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}
func StartOfYear() time.Time {
ref := time.Now()
return time.Date(ref.Year(), time.January, 1, 0, 0, 0, 0, ref.Location())
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}
// https://stackoverflow.com/a/18632496
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
}