Getting date from datepicker wrt different timezones - ios

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!)
}