This is an issue or bug that has occurred before.
In my team, there was a bug where some iPhone users were using the 12-hour format while others were using the 24-hour format when displaying dates.
I tried to help solve this issue, but in the Simulator, there was no option to switch the time format between 12-hour and 24-hour — it’s only available on a real iPhone device.
After some research, I discovered the solution changing the region settings, as each country uses different date and time formats.
Go to Simulator > Settings App > General > Language & Region > Region > Select the Region
Regions Using the 24-Hour Format
- Europe: Most European countries (e.g., France, Germany, Spain, Italy, Sweden, etc.).
- Asia: Many Asian countries (e.g., Japan, Indonesia, South Korea, etc.).
Regions Use the 12-Hour Format
- United States, United Kingdom, United Kingdom, Hong Kong
To check whether the iPhone is using AM/PM or 24-hour format, you can use the Locale
and DateFormatter
in Swift. Here's an example:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
if isUsing24HourFormat() {
print("The device is using a 24-hour format.")
} else {
print("The device is using AM/PM format.")
}
}
func isUsing24HourFormat() -> Bool {
let formatter = DateFormatter()
formatter.locale = Locale.current
formatter.dateStyle = .none
formatter.timeStyle = .short
let dateString = formatter.string(from: Date())
return !dateString.contains("AM") && !dateString.contains("PM")
}
}
By using this, you can check whether the user is using the 12-hour or 24-hour format. From there, you can adjust the date or time data according to your needs.
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