Swift - 前一周的开始日和结束日

Question

今天是 3 月 6 日星期五。如何找到 2 月 16 日是开始日，2 月 22 日是前一周的结束日。16 是我的国家保加利亚在美国将是 15 和 21 我使用 .currentCalendar()

Answer 1

像这样的东西应该可以工作:

let cal = NSCalendar.currentCalendar()

let components = NSDateComponents()
components.weekOfYear -= 1

if let date = cal.dateByAddingComponents(components, toDate: NSDate(), options: NSCalendarOptions(0)) {
    var beginningOfWeek: NSDate?
    var weekDuration = NSTimeInterval()
    if cal.rangeOfUnit(.CalendarUnitWeekOfYear, startDate: &beginningOfWeek, interval: &weekDuration, forDate: date) {
        let endOfWeek = beginningOfWeek?.dateByAddingTimeInterval(weekDuration)
        print(beginningOfWeek) // Optional(2015-02-15 05:00:00 +0000)
        print(endOfWeek) // Optional(2015-02-22 05:00:00 +0000)
    }
}