is it possible to change the date of easy profile to jalali date?

you mean by the registration date and last visit date?

or is it possible to change the date source of easy profile to read date from joomla source

For these date we use Joomla language string "DATE_FORMAT_LC3", with this the date will be according with Time Zone configured in Joomla. You can override this string value from Extensions->Language Manager->Override

We use same Joomla constant (DATE_FORMAT_LC3) of default Joomla use profile page.

DATE_FORMAT_LC3 is used in template file of Joomla com_users(frontend) and Easy Profile, it's possible that Joomla uses another constant for backend, check the value of this constant for your language in Extensions->Language Manager->Overrides