124 lines
3.0 KiB
Go
124 lines
3.0 KiB
Go
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package timex
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import (
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"math"
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"time"
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)
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// IsAmericaSummerTime 是否为美国夏令时间
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// 夏令时开始于每年3月的第二个周日凌晨，人们需要将时间调早 (顺时针) 1个小时；
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// 夏令时结束于每年11月的第一个周日凌晨，人们需要将时间调晚 (逆时针) 1个小时。
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func IsAmericaSummerTime(t time.Time) (yes bool) {
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if t.IsZero() {
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return
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}
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month := t.Month()
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switch month {
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case 4, 5, 6, 7, 8, 9, 10:
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yes = true
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case 3, 11:
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day := t.Day()
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t1 := t.AddDate(0, 0, -day+1)
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weekday := int(t1.Weekday())
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if (month == 3 && day >= t1.AddDate(0, 0, 14-weekday).Day()) ||
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(month == 11 && day < t1.AddDate(0, 0, 7-weekday).Day()) {
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yes = true
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}
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}
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return
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}
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// ChineseTimeLocation Return chinese time location
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func ChineseTimeLocation() *time.Location {
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loc, err := time.LoadLocation("Asia/Shanghai")
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if err != nil {
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loc = time.FixedZone("CST", 8*3600)
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}
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return loc
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}
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func Between(t, begin, end time.Time) bool {
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return (t.After(begin) && t.Before(end)) || t.Equal(begin) || t.Equal(end)
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}
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func DayStart(t time.Time) time.Time {
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return time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, time.Local)
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}
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func DayEnd(t time.Time) time.Time {
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return time.Date(t.Year(), t.Month(), t.Day(), 23, 59, 59, 999999999, time.Local)
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}
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func MonthStart(t time.Time) time.Time {
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return time.Date(t.Year(), t.Month(), 1, 0, 0, 0, 0, time.Local)
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}
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func MonthEnd(t time.Time) time.Time {
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return DayEnd(MonthStart(t).AddDate(0, 1, -1))
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}
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// IsAM Check is AM
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func IsAM(t time.Time) bool {
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return t.Hour() <= 11
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}
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// IsPM Check is PM
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func IsPM(t time.Time) bool {
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return t.Hour() >= 12
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}
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func WeekStart(yearWeek int) time.Time {
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year := yearWeek / 100
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week := yearWeek % year
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// Start from the middle of the year:
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t := time.Date(year, 7, 1, 0, 0, 0, 0, time.UTC)
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// Roll back to Monday:
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if wd := t.Weekday(); wd == time.Sunday {
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t = t.AddDate(0, 0, -6)
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} else {
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t = t.AddDate(0, 0, -int(wd)+1)
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}
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// Difference in weeks:
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_, w := t.ISOWeek()
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t = t.AddDate(0, 0, (week-w)*7)
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return t
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}
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func WeekEnd(yearWeek int) time.Time {
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t := WeekStart(yearWeek).AddDate(0, 0, 6)
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return time.Date(t.Year(), t.Month(), t.Day(), 23, 59, 59, 0, time.UTC)
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}
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func YearWeeksByWeek(startYearWeek, endYearWeek int) []int {
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weeks := make([]int, 0)
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weekStart := WeekStart(startYearWeek)
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weekEnd := WeekStart(endYearWeek)
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for {
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if weekStart.After(weekEnd) {
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break
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}
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y, w := weekStart.ISOWeek()
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weeks = append(weeks, y*100+w)
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weekStart = weekStart.AddDate(0, 0, 7)
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}
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return weeks
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}
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func YearWeeksByTime(startDate, endDate time.Time) []int {
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y1, w1 := startDate.ISOWeek()
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y2, w2 := endDate.ISOWeek()
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return YearWeeksByWeek(y1*100+w1, y2*100+w2)
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}
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// XISOWeek 非 ISO 周，从周日开始算起作为一周的第一天
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func XISOWeek(t time.Time) (year, week int) {
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t1 := time.Date(t.Year(), t.Month(), t.Day()+4-int(t.Weekday()), 0, 0, 0, 0, time.UTC)
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startTime := time.Date(t1.Year(), 1, 1, 0, 0, 0, 0, time.UTC)
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week = int(math.Ceil((float64((t1.Unix()-startTime.Unix())/86400) + 1) / 7))
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return startTime.Year(), week
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}
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