change gregorian calendar to solar hijri calendar

[Ponivi]

Hello my friend
I first want to thank you for the great and cool calendar that you designed perfectly.
I'm using that for my web application and really appericaite that.
I have a question, dear Edlyn:
I want to use calendar as solar hijri date but the default calendar is "gregorian" .
how can I change gregorian calendar to solar hijri calendar ?
can you help me please ?

best regards
Hengameh