Same Countdown in different TimeZone - Swift - swift

Question

I have already create a countdown that's working fine on CEST time zone, but I want that will show the same correct time remaining in all the countries with different Time Zone.
Any idea on how can I manipulate the code?
// here we set the current date
let date = NSDate()
let calendar = Calendar.current
let components = calendar.dateComponents([.hour, .minute, .month, .year, .day], from: date as Date)
let currentDate = calendar.date(from: components)
let userCalendar = Calendar.current
// here we set the due date. When the timer is supposed to finish
let competitionDate = NSDateComponents()
competitionDate.year = year
competitionDate.month = month
competitionDate.day = day
competitionDate.hour = hour
competitionDate.minute = minute
let competitionDay = userCalendar.date(from: competitionDate as DateComponents)!
//here we change the seconds to hours,minutes and days
let competitionDayDifference = calendar.dateComponents([.day, .hour, .minute], from: currentDate!, to: competitionDay)
//finally, here we set the variable to our remaining time
let daysLeft = competitionDayDifference.day
let hoursLeft = competitionDayDifference.hour
let minutesLeft = competitionDayDifference.minute
print("day:", daysLeft ?? "N/A", "hour:", hoursLeft ?? "N/A", "minute:", minutesLeft ?? "N/A")

Answer 1

Your current code doesn't work because the competition day is not represented by a point in time (x seconds since 1970), but as a local date time (year, month, day, hour, minute etc) instead.
To represent the competition date as a point in time, you need to associate it with a timezone, which you haven't provided. You can provide one to the Calendar that you use to get the Date from the date components:
var userCalendar = Calendar.current
userCalendar.timeZone = TimeZone(identifier: "...")!
And then the competition date will be converted to the same point in time no matter what timezone the device is in.
Alternatively, set competitionDate.timeZone:
competitionDate.timeZone = TimeZone(identifier: "...")!