ios – 在Swift中将日期从GMT 1转换为UTC时出现混乱

当您尝试将“2016-06-23 12:00:00”转换为UTC日期时,我会收到“2016-06-23 10:00:00”

第一个日期是GMT 1,我想转换为UTC.如果我没弄错GMT 0 == UTC所以12:00应该是11:00对吗？但我总是得到10点.为什么会这样,我该如何正确转换它？

我在操场上和实际设备上都试过这个

这是我使用的代码：

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view,typically from a nib.

    let dateString:string = "2016-06-23 12:00:00"

    print("1: "+dateString)

    print("2: "+convertDateToUTC(dateString))

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func convertDateToUTC(_ dateString:string) -> String {

    let dateForm = DateFormatter()
    dateForm.dateFormat = "yyyy-MM-dd HH:mm:ss"
    dateForm.timeZone = TimeZone(abbreviation: "GMT+1")

    print(TimeZone.current.abbreviation()!)

    let date = dateForm.date(from: dateString)

    dateForm.timeZone = TimeZone(abbreviation: "UTC")

    let date1 = dateForm.String(from: date!)

    return date1

}

}

输出：

1: 2016-06-23 12:00:00
GMT+1
2: 2016-06-23 10:00:00

let tz = TimeZone(abbreviation: "GMT+1")
 print(tz) // nil

dateForm.timeZone = TimeZone(abbreviation: "GMT+1")

dateForm.timeZone = TimeZone(abbreviation: "GMT+01")

dateForm.timeZone = TimeZone(secondsFromGMT: 3600)
dateForm.timeZone = TimeZone(identifier: "GMT+0100")

TimeZone(identifier: "GMT+0100") 
TimeZone(identifier: "Europe/Berlin")