Get the Jalali calendar type code from https://github.com/rezaies/moodle-calendartype_jalali  and install it on your Moodle Log in as admin Click on your name at the top right and go to the preference page Go to the calendar preferences page and set your preferred calendar to Persian Click on the messaging icon at the top right of the page to open the messaging drawer Send a message to a user (can be yourself) Verify that the day you see above the message is not in Gregorian. Depending on when you are testing this, the month can be either "Aban", "Azar" or "Esfand" (Hopefully not later).