Go語言中使用import關(guān)鍵字導(dǎo)入包，包的名字使用雙引號（""）包裹起來。

golang判斷當前時間是第幾周：

func main() {  	l, _ := time.LoadLocation("Asia/Shanghai") 	startTime,_ := time.ParseInLocation("2006-01-02", "2018-12-22", l) 	endTime,_ := time.ParseInLocation("2006-01-02", "2019-05-17", l)  	datas := GroupByWeekDate(startTime, endTime) 	for _, d := range datas { 		fmt.Println(d) 	}  }  //判斷時間是當年的第幾周 func WeekByDate(t time.Time) string { 	yearDay := t.YearDay() 	yearFirstDay := t.AddDate(0, 0, -yearDay+1) 	firstDayInWeek := int(yearFirstDay.Weekday())  	//今年第一周有幾天 	firstWeekDays := 1 	if firstDayInWeek != 0 { 		firstWeekDays = 7 - firstDayInWeek + 1 	} 	var week int 	if yearDay <= firstWeekDays { 		week =  1 	} else { 		week = (yearDay-firstWeekDays)/7 + 2 	} 	return fmt.Sprintf("%d第%d周", t.Year(), week) }  type WeekDate struct { 	WeekTh    string 	StartTime time.Time 	EndTime   time.Time }  // 將開始時間和結(jié)束時間分割為周為單位 func GroupByWeekDate(startTime, endTime time.Time) []WeekDate { 	weekDate := make([]WeekDate, 0) 	diffDuration := endTime.Sub(startTime) 	days := int(math.Ceil(float64(diffDuration / (time.Hour * 24))))+1  	currentWeekDate := WeekDate{} 	currentWeekDate.WeekTh = WeekByDate(endTime) 	currentWeekDate.EndTime = endTime 	currentWeekDay := int(endTime.Weekday()) 	if currentWeekDay == 0 { 		currentWeekDay = 7 	} 	currentWeekDate.StartTime = endTime.AddDate(0, 0, -currentWeekDay+1) 	nextWeekEndTime := currentWeekDate.StartTime 	weekDate = append(weekDate, currentWeekDate)  	for i := 0; i < (days-currentWeekDay)/7; i++ { 		weekData := WeekDate{} 		weekData.EndTime = nextWeekEndTime 		weekData.StartTime = nextWeekEndTime.AddDate(0, 0, -7) 		weekData.WeekTh = WeekByDate(weekData.StartTime) 		nextWeekEndTime = weekData.StartTime 		weekDate = append(weekDate, weekData) 	}  	if lastDays := (days - currentWeekDay) % 7; lastDays > 0 { 		lastData := WeekDate{} 		lastData.EndTime = nextWeekEndTime 		lastData.StartTime = nextWeekEndTime.AddDate(0, 0, - lastDays) 		lastData.WeekTh = WeekByDate(lastData.StartTime) 		weekDate = append(weekDate, lastData) 	}  	return weekDate }

結(jié)果：

{2019第20周 2019-05-13 00:00:00 +0800 CST 2019-05-17 00:00:00 +0800 CST} {2019第19周 2019-05-06 00:00:00 +0800 CST 2019-05-13 00:00:00 +0800 CST} {2019第18周 2019-04-29 00:00:00 +0800 CST 2019-05-06 00:00:00 +0800 CST} {2019第17周 2019-04-22 00:00:00 +0800 CST 2019-04-29 00:00:00 +0800 CST} {2019第16周 2019-04-15 00:00:00 +0800 CST 2019-04-22 00:00:00 +0800 CST} {2019第15周 2019-04-08 00:00:00 +0800 CST 2019-04-15 00:00:00 +0800 CST} {2019第14周 2019-04-01 00:00:00 +0800 CST 2019-04-08 00:00:00 +0800 CST} {2019第13周 2019-03-25 00:00:00 +0800 CST 2019-04-01 00:00:00 +0800 CST} {2019第12周 2019-03-18 00:00:00 +0800 CST 2019-03-25 00:00:00 +0800 CST} {2019第11周 2019-03-11 00:00:00 +0800 CST 2019-03-18 00:00:00 +0800 CST} {2019第10周 2019-03-04 00:00:00 +0800 CST 2019-03-11 00:00:00 +0800 CST} {2019第9周 2019-02-25 00:00:00 +0800 CST 2019-03-04 00:00:00 +0800 CST} {2019第8周 2019-02-18 00:00:00 +0800 CST 2019-02-25 00:00:00 +0800 CST} {2019第7周 2019-02-11 00:00:00 +0800 CST 2019-02-18 00:00:00 +0800 CST} {2019第6周 2019-02-04 00:00:00 +0800 CST 2019-02-11 00:00:00 +0800 CST} {2019第5周 2019-01-28 00:00:00 +0800 CST 2019-02-04 00:00:00 +0800 CST} {2019第4周 2019-01-21 00:00:00 +0800 CST 2019-01-28 00:00:00 +0800 CST} {2019第3周 2019-01-14 00:00:00 +0800 CST 2019-01-21 00:00:00 +0800 CST} {2019第2周 2019-01-07 00:00:00 +0800 CST 2019-01-14 00:00:00 +0800 CST} {2018第53周 2018-12-31 00:00:00 +0800 CST 2019-01-07 00:00:00 +0800 CST} {2018第52周 2018-12-24 00:00:00 +0800 CST 2018-12-31 00:00:00 +0800 CST} {2018第51周 2018-12-22 00:00:00 +0800 CST 2018-12-24 00:00:00 +0800 CST}