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  1. 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, with 8784 hours, 527,040 minutes, or 31,622,400 seconds.

  2. Apr 17, 2024 · Gregorian calendar, solar dating system now in general use. It was proclaimed in 1582 by Pope Gregory XIII as a reform of the Julian calendar. The Gregorian calendar differs from the Julian only in that no century year is a leap year unless it is exactly divisible by 400 (e.g., 2000).

    • The Editors of Encyclopaedia Britannica
  3. Feb 11, 2022 · Learn the difference between a calendar year and a fiscal year, and how they affect taxation and accounting. A calendar year is a one-year period from January 1 to December 31, while a fiscal year can start and end at any time.