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Prerequisite
Install the Persian calendar from https://github.com/rezaies/moodle-calendartype_jalali
Log in as Admin, then from the user menu click on Preferences
Go to Calendar preferences and set your prefered calendar to the Persian calendar
Test
Create a course and enrol a user to it
From the participants page in the course, click on the gear icon next to the user's name
Modify the form and set a start/end date/duration and save the form
Open the form again and verify that the changes are saved
Repeat steps 3 and 4 with a different combination of data