如何将 UIDatePicker 设置为始终使用 UTC 时间和日期，忽略夏令时

Question

UIDatePicker 我想将 UIDatePicker 设置为始终具有 UTC 时间和日期，忽略任何本地时间和夏令时。在我的应用程序 UIDatePicker 2019 年 3 月 31 日之后，如果我将在文本字段中设置时间 02:00，它将显示 03:00.

`func createDatePicker()  {
    datePicker = UIDatePicker()
    datePicker?.datePickerMode = .dateAndTime
    datePicker?.timeZone = NSTimeZone(name: "GMT")! as TimeZone

    datePicker?.timeZone = TimeZone(secondsFromGMT: 0)

    datePicker?.setValue(UIColor.white, forKey: "textColor")
    datePicker?.backgroundColor = UIColor.black.withAlphaComponent(0.6)

datePicker?.minimumDate = Date.calculateDate(day: 1, month: 1, year: 2019, hour: 0, minute: 0)
datePicker?.maximumDate = Date.calculateDate(day: 1, month: 1, year: 2020, hour: 0, minute: 0)




    // create toll bar
    let toolBar = UIToolbar()
    toolBar.sizeToFit()
    toolBar.barStyle = .blackOpaque

    //add done botton on this tool bar
    let doneBotton = UIBarButtonItem(barButtonSystemItem: .done, target: nil, action: #selector(doneDateClicked))
    toolBar.setItems([doneBotton], animated: true)
    doneBotton.style = .done
    dateTextField.inputAccessoryView = toolBar


    dateTextField.inputView = datePicker
}`

Answer 1

您可以使用以下函数获取您可能需要应用的偏移量以更正夏令时。

datePicker?.timeZone.daylightSavingTimeOffset(for: Date)

Returns the daylight saving time offset for a given date.

Parameters

date: The date to use for the calculation. The default value is the current date.

See Apple Documentation.

如何将 UIDatePicker 设置为始终使用 UTC 时间和日期，忽略夏令时

How can I set up UIDatePicker to always UTC time and date, disregard daylight savings time

xcode

uidatepicker

swift