Polyfill : undefined weekOfYear and yearOfWeek with calendarId = "islamic-civil"

[GldzzPro]

Temporal.PlainDate with calendarId = "islamic-civil" always return undefined weekOfYear and yearOfWeek proprieties

[ptomato]

Most JS implementations will get this data from CLDR, which currently doesn't provide it for any Hijri calendar. There is a proposal to add it, which I recommend you follow: https://github.com/khawarizmus/hijri-week-calendar-proposal

[khawarizmus]

Thank you for the mention @ptomato but for a better developer experience and elaborate documentation and long term support I suggest this library. https://github.com/zamanapp/week-dates

[khawarizmus]

Also to follow the progress of this landing on the CLDR check this issue

khawarizmus/hijri-week-calendar#3

I haven't followed up through this yet but I should be starting that process soon.