从日期选择器获取不同时区的日期

Question

I'm using a standard DatePicker and printing the date on top of it. For some reason my Date Picker has it's timezone set to IST, which maybe because of the locale.

Let's get into an example:

DatePicker -> 12:00 PM Date reads -> 06:30:00 +0000

Which is correct as the date will print UTC time and IST is UTC+5:30

Now when I change the timezone of the DatePicker, let's say to London which is GMT+1 ,

DatePicker -> 12:00 PM Date reads -> 06:30:00 +0000

Where in the date should actually read 11:00:00

How I am changing the DatePicker's timezone:

if let tmz = selectTimeZone {

    datePicker.timeZone = tmz
}

Answer 1

i have the same issue sometime before but for the another reason. Try this hope it will help.

First -

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss" 
var startDate = dateFormatter.string(from: yourdatepicker.date)
startDate = localToUTC(date: startDate)

Second we convert this to local to UTC , here we mention the TimeZone to system time

func localToUTC(date:String) -> String {

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFormatter.timeZone = NSTimeZone.system
dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
let dt = dateFormatter.date(from: date)
return dateFormatter.string(from: dt!)
}

Third if you want to conver UTC to your Local time

func UTCToLocal(date:String) -> String {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
let dt = dateFormatter.date(from: date)
dateFormatter.timeZone = NSTimeZone.system
dateFormatter.dateFormat = "hh:mm a"
return dateFormatter.string(from: dt!)
 }