Calendar year - Wikipedia
The Gregorian year, which is in use in most of the world, begins on January 1 and ends on December 31. It has a length of 365 days in an ordinary year, with 8760 hours, 525,600 minutes, or 31,536,000 seconds; but 366 days in a leap year Julian calendar has an average length of 365.25 days, and the Hebrew calendar has an average length of 365. ...
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