swift problem on calculate time difference - swift

Question

I have develop a function that calculate the time difference between two date giving the two date as string here below the function
func calculateTimeDifference(startDate: String, endDate: String) -> Int {
print("START DATE 1: \(startDate)")
print("END DATE 1: \(endDate)")
let startDate = dateTimeFormatter.date(from: startDate)
let endDate = dateTimeFormatter.date(from: endDate)
print("START DATE 2: \(startDate)")
print("END DATE 2: \(endDate)")
guard let startDate = startDate,
let endDate = endDate else {
print("return 1")
return 0
}
let dateDifference = Calendar.current.dateComponents([.minute], from: startDate, to: endDate)
let minuteDifference = dateDifference.minute
guard let minuteDifference = minuteDifference else {
print("return 2")
return 0
}
//timeDifference = minuteDifference
print("TIME DIFFERENCE: \(minuteDifference)")
return minuteDifference
}
and the corresponding date formatter that I'm using
var dateFormatter : DateFormatter {
let formatter = DateFormatter()
formatter.dateStyle = .short
return formatter
}
var timeFormatter : DateFormatter {
let formatter = DateFormatter()
formatter.timeStyle = .short
return formatter
}
var dateTimeFormatter: DateFormatter {
let formatter = DateFormatter()
formatter.dateFormat = "d, MMM y, HH:mm"
return formatter
}
also try too add before each return formatter: formatter.locale = Locale.current
so now the problem is if I try this code on the simulator it works perfectly this below is the output in console using the simulator:
START DATE 1: 13, mag 2022, 11:36
END DATE 1: 13, mag 2022, 12:06
START DATE 2: Optional(2022-05-13 09:36:00 +0000)
END DATE 2: Optional(2022-05-13 10:06:00 +0000)
when try on physical device the output is this:
START DATE 1: 13, mag 2022, 11:36
END DATE 1: 13, mag 2022, 12:06
START DATE 2: nil
END DATE 2: nil

Answer 1

I guess this related to different locale, as May is Maggio italian
var dateTimeFormatter: DateFormatter {
let formatter = DateFormatter()
formatter.dateFormat = "d, MMM y, HH:mm"
formatter.locale = .init(identifier: "it_CH") // for italian locale
return formatter
}
calculateTimeDifference(startDate: "13, mag 2022, 11:36", endDate: "13, mag 2022, 12:06")
and the results
START DATE 1: 13, mag 2022, 11:36
END DATE 1: 13, mag 2022, 12:06
START DATE 2: Optional(2022-05-13 09:36:00 +0000)
END DATE 2: Optional(2022-05-13 10:06:00 +0000)
TIME DIFFERENCE: 30