## Calendar Systems

### Description

With the help of the category called Calendarsystems, you can transform a date to a different calendar system.
For now three calendar systems are supported:
Gregorian Calender
see also http://en.wikipedia.org/wiki/Gregorian_Calender
Maya Calender (Lange Zählung)
see also http://de.wikipedia.org/wiki/Maya-Kalender
Islamic Calender
see also http://de.wikipedia.org/wiki/Islamische_Zeitrechnung
The implementation of the islamic calender is the one according to al-Fazārī, al-Khwārizmī and al-Battānī, which is also known as the "Toledan Tables", and the "Alfonsine Tables". See also http://www.staff.science.uu.nl/~gent0113/islam/islam_tabcal.htm

### Copyright/Credits

The calendar system calculation is done by the excellent work of Hannu Väisäsen from Finland.
See also http://joyds1.joensuu.fi/calendar/index.html (GPL2+)