golang 将开始时间和结束时间分割为周为单位

// 将开始时间和结束时间分割为周为单位
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.AddDate(0, 0, -1)
      //fmt.Println(nextWeekEndTime.AddDate(0, 0, -1))
      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.AddDate(0, 0, -1)
      lastData.StartTime = nextWeekEndTime.AddDate(0, 0, -lastDays)
      _, _, lastData.WeekTh, _ = WeekByDate(lastData.StartTime)

      weekDate = append(weekDate, lastData)
   }

   sort.Slice(weekDate, func(i, j int) bool {
      return true
   })
   return weekDate
}


func WeekByDate(t time.Time) (y int, m int, w int, d string) {
   yearDay := t.YearDay()
   yearFirstDay := t.AddDate(0, 0, -yearDay+1)
   firstDayInWeek := int(yearFirstDay.Weekday())
   //今年第一周有几天
   firstWeekDays := 1
   if firstDayInWeek != 0 {
      firstWeekDays = 7 - firstDayInWeek + 1
   }
   var week int
   if yearDay <= firstWeekDays {
      week = 1
   } else {
      if (yearDay-firstWeekDays)%7 > 0 {
         week = (yearDay-firstWeekDays)/7 + 2
      } else {
         week = (yearDay-firstWeekDays)/7 + 1
      }
   }

   m, _ = strconv.Atoi(t.Format("1"))
   day := t.Format(LayoutDate)
   //fmt.Println(t.Year(),m, week,day)
   return t.Year(), m, week, day
}