How to change the calendar default type to islamic or persian calendar?

[Kal_Lam]

Welcome to the community, @Besmallaharya! You could do this as outlined in this post discussed previously:

Is there any means to automatically fill the date in G.C when data is entered in other calendar?

@gute, you could do this as outlined in the image shared below: In the survey tab of your XLSForm: [image] Reference XLSForm: Ethiopian Date.xlsx (10.2 KB) Note: This best works with Collect android app. The date inputs are taken in Ethiopian Format but are stored in AD. You should be able to learn more about the date format here.

You should be able to learn more about the Islamic date format here and the Persian date format here.