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The Gregorian calendar is the internationally accepted civil calendar. It was first adopted in 1582.
The Gregorian calendar was introduced in 1582 in some countries. The US, Canada, and the UK changed in 1752. Why were some days skipped?
New Year’s Day, which is on January 1, marks the start of the year in the Gregorian calendar and it's a public holiday in many countries. Count down to the New Year, no matter where you are.
New Year's Day falls on January 1 and marks the start of a new year according to the Gregorian calendar. It marks the end of New Year's Eve celebrations in the United States and gives many Americans a chance to remember the previous year.
Our calendar doesn't accurately reflect the time Earth takes to complete a full orbit around the Sun. Why is this? Do other calendars do a better job?
Calendar definition and meaning: Solar and lunar, tropical and sidereal—why did humans invent calendars?
For the first time in nearly 100 years Easter is coming at its earliest on Sunday, March 23, 2008.
Muslims around the world observe the Islamic calendar or Hijri calendar. How does it work and why are the lengths of Islamic months so difficult to predict?
The Persian Solar Hijri calendar is one of the world's most accurate calendar systems. Find out what makes it so precise.
The Jewish calendar is designed to keep in sync with Sun and Moon cycles while also satisfying religious requirements. Find out how it works!