swift - swift 3 中的 Unix 时间戳转换问题

Question

我正在尝试从服务器转换时间戳，它也在转换，但只有月份是错误的。比如时间戳是 1492747393892，它转换为 21/03/17 - 12:03PM，但它应该是 21/04/17 - 中午 12 点 03 分。这是我的代码

var arriveTimestamp: Int 
if let timeStampToDate = arriveTimestamp {
                    let timeSt = Date(jsonTimeDate:"/Date(\(timeStampToDate))/")
                    let time = Date().dateTime(date: timeSt!)
                    valueLbl.text = time
                }

   init?(jsonTimeDate: String) {
    //        "/Date(1487058855745)/"

    let prefix = "/Date("
    let suffix = ")/"
    let scanner = Scanner(string: jsonTimeDate)

    // Check prefix:
    guard scanner.scanString(prefix, into: nil)  else { return nil }

    // Read milliseconds part:
    var milliseconds : Int64 = 0
    guard scanner.scanInt64(&milliseconds) else { return nil }
    // Milliseconds to seconds:
    var timeStamp = TimeInterval(milliseconds)/1000.0

    // Read optional timezone part:
    var timeZoneOffset : Int = 0
    if scanner.scanInt(&timeZoneOffset) {
        let hours = timeZoneOffset / 100
        let minutes = timeZoneOffset % 100
        // Adjust timestamp according to timezone:
        timeStamp += TimeInterval(3600 * hours + 60 * minutes)
    }

    // Check suffix:
    guard scanner.scanString(suffix, into: nil) else { return nil }

    // Success! Create NSDate and return.
    self.init(timeIntervalSince1970: timeStamp)
}

func dateTime(date: Date) -> String {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd/mm/yy - hh:mm a"
    return dateFormatter.string(from: date as Date)
}

Answer 1

代码中的主要错误是错误的月份日期格式，应该是“MM”，而不是“mm”(代表分钟)。

除此之外，您的方法太复杂了。所有你必须做的是将时间戳(以毫秒为单位)除以 1000并调用 Date(timeIntervalSince1970:):

let arriveTimestamp = 1492747393892
let date = Date(timeIntervalSince1970: TimeInterval(arriveTimestamp)/1000)
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd/MM/yy - hh:mm a"
let text = dateFormatter.string(from: date)

print(text) // 21/04/17 - 06:03 AM