swift 将Date转换为Int，或将当前Date格式化为String

Posted 2021-05-19

extension Date {
    var millisecondsSince1970:Int {
        return Int((self.timeIntervalSince1970 * 1000.0).rounded())
    }
    
    var secondsSince1970:Int {
        return Int((self.timeIntervalSince1970).rounded())
    }
    
    init(milliseconds:Int) {
        self = Date(timeIntervalSince1970: TimeInterval(milliseconds / 1000))
    }

    func getCurrentTimeString(_ format: String = "yyyy-MM-dd HH:mm:ss") -> String {
        let nowDate = Date()
        let formatter = DateFormatter()
        formatter.dateFormat = format
        formatter.locale = Locale(identifier: "en_US_POSIX")
        formatter.timeZone = Foundation.TimeZone(identifier: "UTC")
        //formatter.dateStyle = .MediumStyle
        //formatter.timeStyle = .MediumStyle
        return formatter.string(from: nowDate)
    }
    
    var iso8601: String {
        return Formatter.iso8601.string(from: self)
    }
}