This is a solved problem if they were using iOS-native APIs. Mac OS and its derivatives have had support for that since inception. If they used native APIs to display dates, then the format would be dictated by the system settings (that you can change in the Settings app in iOS). I used to work on the localization of then MacOS X into several languages and have chased down tons of bugs like those. Even at Apple a lot of engineers didn’t think about localizability and hard-coded many things that had to be localized.
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