Most Asgard citizens were born long before the asgardian calendar appeared !!!

So how and what date will be written in each asgardian's passport? The date as it appears in the Asgardian or Gregorian calendar, or both ???

I'm waiting for your answers below !!!

I would expect both dates otherwise they would become borderline useless.

What about write the D.O.B in Gregorian (for Earth), Holocene and Asgardian for Asgardia. DD MM (Y)YYYY would probably be the most appropriate order.