我用UTC表示当前时间,然后用纳秒表示,然后我需要用纳秒表示,然后返回到当地时间表示的日期.我可以将时间转换为纳秒,然后返回到日期字符串,但是当我从字符串转换到日期时,时间会变得复杂.
//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 ) )!
}
}
//时间戳正确,但返回的日期不正确