在Swift中的日期到毫秒和更新 [英] Date to milliseconds and back to date in Swift
本文介绍了在Swift中的日期到毫秒和更新的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我以当前时间(以UTC为单位),并将其置于nanaoseconds,然后我需要花费纳秒并返回当地时间的日期。我能够把时间缩短到纳秒,然后回到日期字符串,但是当我从字符串变为日期时,时间会变得复杂。
I am taking the current time, in UTC, and putting it in nanaoseconds and then I need to take the nanoseconds and go back to a date in local time. I am able to do get the time to nanoseconds and then back to a date string but the time gets convoluted when I go from a string to date.
//Date to milliseconds
func currentTimeInMiliseconds() -> Int! {
let currentDate = NSDate()
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = format
dateFormatter.timeZone = NSTimeZone(name: "UTC") as TimeZone!
let date = dateFormatter.date(from: dateFormatter.string(from: currentDate as Date))
let nowDouble = date!.timeIntervalSince1970
return Int(nowDouble*1000)
}
//Milliseconds to date
extension Int {
func dateFromMilliseconds(format:String) -> Date {
let date : NSDate! = NSDate(timeIntervalSince1970:Double(self) / 1000.0)
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = format
dateFormatter.timeZone = TimeZone.current
let timeStamp = dateFormatter.string(from: date as Date)
let formatter = DateFormatter()
formatter.dateFormat = format
return ( formatter.date( from: timeStamp ) )!
}
}
//时间戳是正确的,但返回的日期是't
//The timestamp is correct but the date returned isn't
推荐答案
我不明白你为什么要用字符串做任何事情......
I don't understand why you're doing anything with strings...
extension Date {
var millisecondsSince1970:Int {
return Int((self.timeIntervalSince1970 * 1000.0).rounded())
}
init(milliseconds:Int) {
self = Date(timeIntervalSince1970: TimeInterval(milliseconds) / 1000)
}
}
Date().millisecondsSince1970 // 1476889390939
Date(milliseconds: 0) // "Dec 31, 1969, 4:00 PM" (PDT variant of 1970 UTC)
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