Khayam: A Persian Calendar Program
Calendar Converters (Fourmilab, Switzerland, Extensive page for conversions of Persian, Hebrew, Islamic, Bah'ai Calendar)
Hijri Calendar Converter (from Islamicity.com)
The Islamic Calendar (Calendars through the Ages)
The Jewish Calendar (Calendars through the Ages)
Other In-Use Calendars (Ethiopian, Persian, Balinese, and Baha'i calendars (Calendars through the Ages)
Other Ancient Calendars (Includes Babylonian and Egyptian calendars (Calendars through the Ages)
The Islamic and Christian Calendars AD 622-2222 (AH 1-1650)
Calendar Conversion Tables: Hijri Shamsi (solar)- Hijri Qamari (lunar)- A.D. Gregorian Shamsi 1250-1400/Qamari 128801443/A.D. 1871-2020 with a Supplement Hijri Qamari (lunar)- Gregorian Hijra 1-1288/A.D. 622- 1871