Go에서 주어진 주 번호에 대한 날짜 범위를 계산하는 방법은 무엇입니까?

func WeekStart(year, week int) time.Time {
    t := time.Date(year, 7, 1, 0, 0, 0, 0, time.UTC)
    if wd := t.Weekday(); wd == time.Sunday {
        t = t.AddDate(0, 0, -6)
    } else {
        t = t.AddDate(0, 0, -int(wd)+1)
    }
    _, w := t.ISOWeek()
    t = t.AddDate(0, 0, (week-w)*7)
    return t
}

fmt.Println(WeekStart(2018, 1))
// Output: 2018-01-01 00:00:00 +0000 UTC
fmt.Println(WeekStart(2018, 2))
// Output: 2018-01-08 00:00:00 +0000 UTC

func WeekRange(year, week int) (start, end time.Time) {
    start = WeekStart(year, week)
    end = start.AddDate(0, 0, 6)
    return
}