The Zoroastrian Calendar app is a calendar for all Iranians which is a mix of the ancient Iranian calendar and the current calendar.
Zoroastrian Calendar Features:
See the name of ancient days
See the events of ancient Iran
See the pilgrimage days of the sanctuaries
Seeing the avoidable days of eating helpful animal meat (Nabor)
Possibility to record events and reminders on a specified day
Automatic update
And ...