问题描述

我正在尝试制作一个考勤应用程序，但我对 iOS 和 Firebase 中的日期和时间感到非常困惑.

I'm trying to make an attendance app and I am really confused about date and time in iOS and Firebase.

我使用日期作为 Key，这是我的 Firebase 数据库的结构.

I use date as Key, this is the structure of my Firebase database.

--Employees
  --Unique_ID
     --Details
          Name: John
     --Attendance
          --dateToday
              Timein: 8:00 AM
              Timeout: 5:00 PM
              BreakStart: 12:00 PM
              BreakFinish: 1:00 PM

这是获取我用作密钥的日期时间戳的代码

This is my code to get the date timestamp I used as Key

 override func viewDidLoad() {
     super.viewDidLoad()

     let now = NSDate()
     let nowTimeStamp = self.getCurrentTimeStampWOMiliseconds(dateToConvert: now)

     // I save this dateToday as Key in Firebase
     dateToday = nowTimeStamp
}


func getCurrentTimeStampWOMiliseconds(dateToConvert: NSDate) -> String {
    let objDateformat: DateFormatter = DateFormatter()
    objDateformat.dateFormat = "yyyy-MM-dd"
    let strTime: String = objDateformat.string(from: dateToConvert as Date)
    let objUTCDate: NSDate = objDateformat.date(from: strTime)! as NSDate
    let milliseconds: Int64 = Int64(objUTCDate.timeIntervalSince1970)
    let strTimeStamp: String = "(milliseconds)"
    return strTimeStamp
}

但是当我将它转换回日期时，我得到 2017-09-22 16:00:00 +0000，这是错误的，因为在我的位置是 9 月 23 日.

But when I convert it back to date I get 2017-09-22 16:00:00 +0000, which is wrong because it is 23rd of September in my location.

什么是正确的代码，以便我可以获得正确的日期时间戳和时间时间戳?

What is the right code to use so that I can get the correct date timestamp and time timestamp?

推荐答案

为了将当前时间保存到 firebase 数据库，我使用了 Unic Epoch Conversation:

For saving Current time to firebase database I use Unic Epoch Conversation:

let timestamp = NSDate().timeIntervalSince1970

用于将 Unix 纪元时间解码为 Date().

and For Decoding Unix Epoch time to Date().

let myTimeInterval = TimeInterval(timestamp)
let time = NSDate(timeIntervalSince1970: TimeInterval(myTimeInterval))

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