问 在Swift中将日期转换为整数

EN

Date 到 Int

// using current date and time as an example
let someDate = Date()
// convert Date to TimeInterval (typealias for Double)
let timeInterval = someDate.timeIntervalSince1970
// convert to Integer
let myInt = Int(timeInterval)

执行 Double 到 Int 的转换会导致毫秒的丢失。如果需要毫秒，那么在转换为 Int 之前乘以1000。

Int 到 Date

包括相反的完整性。

// convert Int to TimeInterval (typealias for Double)
let timeInterval = TimeInterval(myInt)
// create NSDate from Double (NSTimeInterval)
let myNSDate = Date(timeIntervalSince1970: timeInterval)
I could have also used `timeIntervalSinceReferenceDate` instead of `timeIntervalSince1970` as long as I was consistent. This is assuming that the time interval is in seconds. Note that Java uses milliseconds.

备注

• 有关使用 NSDate 的Swift 2旧语法，请参见 this answer 。

如果您正在寻找具有 10 Digit seconds since 1970 for API 调用的 时间戳 ，那么下面是代码：

仅1行代码用于Swift 4/ Swift 5

let timeStamp = UInt64(Date().timeIntervalSince1970)

print(timeStamp) <--打印当前时间戳

1587473264

let timeStamp = UInt64((Date().timeIntervalSince1970) * 1000) // will give 13 digit timestamp in milli seconds

timeIntervalSince1970 是一个相关的启动时间，方便，并由苹果提供。

如果你想让int值变小，你可以选择你喜欢的启动时间。

extension Date{
    var intVal: Int?{
        if let d = Date.coordinate{
             let inteval = Date().timeIntervalSince(d)
             return Int(inteval)
        return nil
    // today's time is close to `2020-04-17 05:06:06`
    static let coordinate: Date? = {
        let dateFormatCoordinate = DateFormatter()
        dateFormatCoordinate.dateFormat = "yyyy-MM-dd HH:mm:ss"
        if let d = dateFormatCoordinate.date(from: "2020-04-17 05:06:06") {
            return d
        return nil
extension Int{
    var dateVal: Date?{
        // convert Int to Double
        let interval = Double(self)
        if let d = Date.coordinate{
            return  Date(timeInterval: interval, since: d)
        return nil
}

像这样使用：

    let d = Date()