Support for alternative calendars formats (Hijri, Jewish, Hindu, etc)
As the title mentions, it would be great to have support for alternative calendars. I frequently need to consider dates from the Hijri calendar (in addition to Gregorian), so it would be nice to be able to see dates from both Hijri and Gregorian at the same time.

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Ashkan commented
Yes that's right! also the Persian Calendar
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meatyari commented
yeah I need that feature too, please include the Persian calendar as well.
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Anonymous commented
In order to be able to use Proton as my primary calendar, I would need to be able to add Jewish Holidays and dates as well as ones from Israel which is not currently included in the list of countries.
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Kenji Teo commented
It will also be great if I can create events based on alternative calendar dates instead.