As of Version 10.0, calendar functionality is built into the Wolfram Language
is an option for calendar functions that specifies which calendar system to use.
- To use Calendar, you first need to load the Calendar Package using Needs["Calendar`"].
- Calendar->system specifies to use calendar system system.
- The following settings can be given:
- With Calendar->Automatic, the Julian calendar is used before September 3, 1752, and the Gregorian calendar after September 13, 1752.
Compute the number of days in the Islamic year 1420:
Compute the number of days in the Jewish year 5760:
In the Julian calendar, the year 1900 was a leap year:
This is not true in the standard (Gregorian) Western calendar: