使用time包获取指定数量年、季度、月、周边界

1.定义返回数据结构体：

type formatBorder struct {
     Start string  `json:"start"`
     End   string  `json:"end"`
     Name  string  `json:"name"`
}

2.获取年边界：

func yearDemo(num int) ([]formatBorder) {
     res := make([]formatBorder,num)
     now := time.Now()
     for i :=0 ; i < num ; i++{
         year := now.AddDate(-i,0,0).Year()
         res[num-i-1] = formatBorder{fmt.Sprintf("%v-01-01",year), fmt.Sprintf("%v-12-31",year), fmt.Sprintf("%v年",year)}
     }
     return res
}

3.获取季度边界:

func quarterDemo(num int) ([]formatBorder) {
     res := make([]formatBorder,num)
     now := time.Now()
     for i :=0 ; i < num ; i++{
         local := now.AddDate(0,-3*i,0)
         start , end , name  , year:= "" , "" ,"" , local.Year()
         switch int(local.Month()) {
         case 1,2,3:
             start = fmt.Sprintf("%v-01-01",year)
             end   = fmt.Sprintf("%v-03-31",year)
             name  = fmt.Sprintf("%v-Q1",year)
         case 4,5,6:
             start = fmt.Sprintf("%v-04-01",year)
             end   = fmt.Sprintf("%v-06-30",year)
             name  = fmt.Sprintf("%v-Q2",year)
         case 7,8,9:
             start = fmt.Sprintf("%v-07-01",year)
             end   = fmt.Sprintf("%v-09-30",year)
             name  = fmt.Sprintf("%v-Q3",year)
         default:
             start = fmt.Sprintf("%v-10-01",year)
             end   = fmt.Sprintf("%v-12-31",year)
             name  = fmt.Sprintf("%v-Q4",year)
         }
         res[num-i-1] = formatBorder{start,end,name}
     }
     return res
}

4.获取月边界:

func monthDemo(num int) ([]formatBorder){
     res := make([]formatBorder,num)
     dateStart ,_:= time.Parse("2006-01-02",fmt.Sprintf("%v-01",time.Now().Format("2006-01")))
     for i := 0 ; i < num ; i++ {
         start := dateStart.AddDate(0,-i,0).Format("2006-01-02")
         end   := dateStart.AddDate(0,-(i-1),-1).Format("2006-01-02")
         name  := fmt.Sprintf("%v年%v月",start[0:4],start[5:7])
         res[num-i-1] = formatBorder{start,end,name}
     }
     return res
}

5.0 周边界：

func weekendBase(t time.Time) formatBorder{
    start , end := "" , ""
    switch int(t.Weekday()) {
    case 0:
        start = t.AddDate(0,0,-6).Format("2006-01-02")
        end   = t.Format("2006-01-02")
    default:
        start = t.AddDate(0,0,-int(t.Weekday())+1).Format("2006-01-02")
        end   = t.AddDate(0,0,7-int(t.Weekday())).Format("2006-01-02")
    }
    return formatBorder{start,end,"周边界"}
}

5.1 本周边界：

func thisWeekendBorder() formatBorder{
     return weekendBase(time.Now())
}

5.2 上周边界：

func preWeekendBorder() formatBorder{
     return weekendBase(time.Now().AddDate(0,0,-7))
}

5.3 下周边界：

func nextWeekendBorder() formatBorder{
     return weekendBase(time.Now().AddDate(0,0,7))
}