swift - 工作日的时间戳出错

Question

我做了这个函数:

func getDayOfWeek(date: NSDate) -> String? {
    let myCalendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
    let myComponents = myCalendar?.components(NSCalendarUnit.CalendarUnitWeekday, fromDate: date)
    let weekDay = myComponents?.weekday
    println(date)
    return weekNumberToWord(weekDay!)
}

我给它一个时间戳作为日期(1439460000，这是今天的日期)并打印:2046-08-13 10:00:00 +0000。这怎么可能？

我是这样调用函数的:

var day = getDayOfWeek(NSDate(timeIntervalSinceReferenceDate: timestamp.doubleValue))!

其中 getDayOfWeek() 是一个开关，将所有数字转换为日期名称作为字符串。

Answer 1

您使用了错误的初始值设定项:

init(timeIntervalSinceReferenceDate:)

Returns an NSDate object initialized relative the first instant of 1 January 2001, GMT by a given number of seconds.

您应该使用 init(timeIntervalSince1970 seconds: NSTimeInterval) 从 UNIX 时间戳(您显然正在使用)初始化日期:

Returns an NSDate object set to the given number of seconds from the first instant of 1 January 1970, GMT.

var day = getDayOfWeek(NSDate(timeIntervalSince1970: timestamp.doubleValue))!