I changed the title as suggested. Thanks!
Removed the unsupported-install tag - this question is unrelated to that fact. Though @serkhelesheyi I do recommend you install using the official install instructions to avoid other kinds of problems you might get into.
Looks like @osama answered this question over there. There is no supported way to display dates and times in Jalali (not Gregorian) but it could be implemented in a plugin if somebody had time and interest to do that.