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+)