Advances Drupal's already awesome localization support one more big step
ahead! by Adding support for different calendar systems like Iranian ,
Jalali , Hijir , Hebew etc. This support is currently limited to display
and data entry for date fields and the back-end date is always
Iranian (jalali) and Gregorian (Using PHP's built-in) calendar are the the only supported calendar systems right now, but support for more calendar systems is under development.
More information is availble here : Calendar Systems | drupal.org
Please send question,issues regarding to this project here : Issues for Calendar Systems | drupal.org