我如何从epoc获得毫秒，直到今天开始？使用swift

Question

var timeIntervalSince1970: NSTimeInterval {get} 

我只希望有人能帮助我。

Answer 1

这将以秒为单位返回时间，如果需要，您可以将其更改为返回毫秒。

var timeIntervalSince1970Seconds: NSTimeInterval { 
    return NSDate().timeIntervalSince1970 
} 
var timeIntervalSince1970MilliSeconds: NSTimeInterval { 
    return NSDate().timeIntervalSince1970 * 1000 
} 

timeIntervalSince1970Seconds  // 1,418,990,057.24468 
timeIntervalSince1970MilliSeconds // 1,418,990,057,246.31 

如果你需要它，从中午12点来算，你可以根据以下步骤做：

extension NSDate { 

    var day: Int { return NSCalendar.currentCalendar().components(NSCalendarUnit.CalendarUnitDay, fromDate: self).day } 
    var month: Int { return NSCalendar.currentCalendar().components(NSCalendarUnit.CalendarUnitMonth, fromDate: self).month } 
    var year: Int { return NSCalendar.currentCalendar().components(NSCalendarUnit.CalendarUnitYear, fromDate: self).year } 

    var today12am: NSDate { 
     return NSCalendar.currentCalendar().dateWithEra(1, year: year, month: month, day: day, hour: 0, minute: 0, second: 0, nanosecond: 0)! 
    } 
} 

var timeIntervalSince1970Sec: NSTimeInterval { 
    return NSDate().today12am.timeIntervalSince1970 
} 
timeIntervalSince1970Sec // 1,418,954,400.0