Support for non-gregorian calendars on iOS

[wongpeiyi]

iOS user was experiencing a crash on opening datepicker:

NSRangeException
*** -[__NSArrayM objectAtIndex:]: index 9223372036854775807 beyond bounds [0 .. 1]

On some investigation the likely cause seems to be a non-Gregorian calendar setting (e.g. Buddhist), which changes the year from 2022 to something like 2565 BE

We are using v2.1.2 with a maxDate (which I suspect is causing the range exception)

I understand this is a rare use case, but wondering if there might be a simple fix that doesn't result in a crash

[skwasjer]

There are ways to supporting it but requires reasonable work and specifically testing. It would need to be configurable through options and explicitly provided, or otherwise inferred from the locale/country (although this is less flexibel and limited through being coupled to this locale, also for representation/localization).
I am open to contributions.

To put you on track, eg. in Android, the Gregorian calendar is hardcoded:
https://github.com/skwasjer/skwas-cordova-plugin-datetimepicker/blob/main/src/android/DateTimePicker.java#L180

In iOS it is not hardcoded (IIRC), and you possibly can address it by setting the correct locale in the plugin options, but I cannot confirm this. Alternatively it could also be modified to either support locale or setting a specific calendar format:
https://stackoverflow.com/a/33373396

[edit] note that if you do not specify a locale in the options, it will use the user/device default