How to get timezone offset as ±hh:mm? - swift

Question

I can get the offset seconds from GMT with this: TimeZone.current.secondsFromGMT().
However, how do I get the format as ±hh:mm?

Answer 1

Some integer arithmetic to obtain the offset in hours and
minutes:
let seconds = TimeZone.current.secondsFromGMT()
let hours = seconds/3600
let minutes = abs(seconds/60) % 60
Formatted printing:
let tz = String(format: "%+.2d:%.2d", hours, minutes)
print(tz) // "+01:00"
%.2d prints an integer with (at least) two decimal digits (and leading
zero if necessary). %+.2d is the same but with a leading + sign for
non-negative numbers.

Answer 2

Here is extension for getting timezone offset Difference and as ±hh:mm (Swift 4 | Swift 5 Code)
extension TimeZone {
func offsetFromUTC() -> String
{
let localTimeZoneFormatter = DateFormatter()
localTimeZoneFormatter.timeZone = self
localTimeZoneFormatter.dateFormat = "Z"
return localTimeZoneFormatter.string(from: Date())
}
func offsetInHours() -> String
{
let hours = secondsFromGMT()/3600
let minutes = abs(secondsFromGMT()/60) % 60
let tz_hr = String(format: "%+.2d:%.2d", hours, minutes) // "+hh:mm"
return tz_hr
}
}
Use like this
print(TimeZone.current.offsetFromUTC()) // output is +0530
print(TimeZone.current.offsetInHours()) // output is "+05:30"

Answer 3

If you can use Date()
func getCurrentTimezone() -> String {
let localTimeZoneFormatter = DateFormatter()
localTimeZoneFormatter.dateFormat = "ZZZZZ"
return localTimeZoneFormatter.string(from: Date())
}
Will return "+01:00" format

Answer 4

extension TimeZone {
func offsetFromUTC() -> String
{
let localTimeZoneFormatter = DateFormatter()
localTimeZoneFormatter.timeZone = self
localTimeZoneFormatter.dateFormat = "Z"
return localTimeZoneFormatter.string(from: Date())
}
func currentTimezoneOffset() -> String {
let timeZoneFormatter = DateFormatter()
timeZoneFormatter.dateFormat = "ZZZZZ"
return timeZoneFormatter.string(from: Date())
}
}
Use like this
print(TimeZone.current.offsetFromUTC()) // output is +0530
print(TimeZone.current.currentTimezoneOffset()) // output is "+05:30"
it working 100% in all countries according to timezone.

Answer 5

Swift 4 and above
extension TimeZone {
func timeZoneOffsetInHours() -> Int {
let seconds = secondsFromGMT()
let hours = seconds/3600
return hours
}
func timeZoneOffsetInMinutes() -> Int {
let seconds = secondsFromGMT()
let minutes = abs(seconds / 60)
return minutes
}
}

Answer 6

The accepted answer does not handle the case "-00:30" correctly since the "+/-" is only being determined from the hours, and not the minutes. I would set the sign based on a check of the initial seconds value. Alternatively you could use DateComponentsFormatter.
let formatter = DateComponentsFormatter()
formatter.allowedUnits = [.hour, .minute, .second]
formatter.unitsStyle = .positional
formatter.zeroFormattingBehavior = .pad
let interval: TimeInterval = TimeInterval.init(abs(secondsOffset))
let offsetValue: String = formatter.string(from: interval)