swift - 我已将设备的当前时间格式设置为 24 小时制，现在我需要使用 "am"、 "pm"从 24 小时制计算 12 小时制时间

Question

func toCheckTimeFormatFromDevice(){
    if Date.is24HoursFormat_1 == true{
        print("phone is set to 24 hours")
        let date = Date()
        let dateFormatter = DateFormatter()
        dateFormatter.timeZone = TimeZone(abbreviation: "GMT") //Set timezone that you want
        dateFormatter.locale = NSLocale.current
        dateFormatter.dateFormat = "hh:mm a" //Specify your format that you want
        let strDate = dateFormatter.string(from: date)
        print(strDate)
    }else{
        print("phone is set to 12 hours")
    }
}

我已将设备当前时间格式设置为 24 小时制，现在我想用“am”、“pm”将时间转换为 12 小时制。

Answer 1

您可以使用以下方法。这对我有用

func convertDate12HourFormat(dateStr: String) -> String {
    let formatter = DateFormatter()
    formatter.dateFormat = "dd/MM/yyyy HH:mm"
    formatter.timeZone = TimeZone(abbreviation: "GMT+0:00")
    let dateFromStr = formatter.date(from: dateStr)
    formatter.dateFormat = "dd/MM/yyyy hh:mm a"

    let strFromDate = formatter.string(from: dateFromStr!)
    return strFromDate
}