Is there a Persian calendar available for ODK?
I am using Aggregate and ODK collect with Xforms
no it's not available. You can create a new topic here https://forum.getodk.org/c/features and describe why you need it.
In Collect we support Ethiopian/Coptic//Islamic calendars but everything is send to aggregate in Gregorian format it's only an appearance.
Good to know. We will use integers.