It's why Pompilius wanted the months to all have an auspicious 29 or 31 days. You can't do that, however, with a 12-month calendar and get an odd number of days in the year because of a simple ...

Whenever celebrity numbers get together ... the earth’s orbit around the sun is approximately 365.25 days, the Gregorian Calendar usually adds a day at the end of February every fourth year.

In addition to being able to recognize the standard dates that you enter into date fields, Microsoft Outlook understands a few date-related phrases you can use instead of standard date values.

Nearly every four years, the Gregorian calendar — which is used in the majority of countries around the world — gets an extra day: February 29. For some people, leap day means frog jokes and ...