Gregorian

The Gregorian Calendar, named after Pope Gregory XIII, is the one used in everyday life in most of the Western world, and for business purposes in most of the world. It has its origins in the last days of the Roman Republic.

It consists of 12 months of varying length :

Name	Duration	Name	Duration
January	31	July	31
February	28 ou 29	August	31
March	31	September	30
April	30	October	31
May	31	November	30
June	30	December	31

Years in which the month of February has 29 days are called leap years. The rules for determining if a year is leap are as follows :

•	True if the year is divisible by 4 (eg. 1980, 1996, 2004).

•	False if the year is divisible by 100 (eg. 1700, 1800, 1900, 2100).

•	True if the year is divisible by 400 (eg. 1600, 2000, 2400, 2800).

Although the Gregorian Calendar is simple to implement as compared to calendars such as the Jewish, Muslim or Chinese, it compensates by having the most complex and diverse holidays rules.

Topic 157000 updated on 14-Oct-05
Topic URL: http://www.qppsupport.net/webhelp/index.html?gregorian.htm