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Leap year. A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year. [1]
A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 September 2024" is ten days after "15 September 2024". The date of a particular event depends on the observed time zone.
The Lunar Hijri calendar is a lunar calendar consisting of 12 months in a year of 354 or 355 days. The astronomer's mean tropical year, which is averaged over equinoxes and solstices, is currently 365.24219 days, slightly shorter than the average length of the year in most calendars. A year can also be measured by starting on any other named ...
The Julian day number (JDN) is the integer assigned to a whole solar day in the Julian day count starting from noon Universal Time, with Julian day number 0 assigned to the day starting at noon on Monday, January 1, 4713 BC, proleptic Julian calendar (November 24, 4714 BC, in the proleptic Gregorian calendar), [4] [5] [6] a date at which three ...
All examples use example date 2021-03-31 / 2021 March 31 / 31 March 2021 / March 31, 2021 – except where a single-digit day is illustrated. Basic components of a calendar date for the most common calendar systems: D – day; M – month; Y – year; Specific formats for the basic components: yy – two-digit year, e.g. 24; yyyy – four-digit ...
t. e. 2008 (MMVIII) was a leap year starting on Tuesday of the Gregorian calendar, the 2008th year of the Common Era (CE) and Anno Domini (AD) designations, the 8th year of the 3rd millennium and the 21st century, and the 9th year of the 2000s decade. 2008 was designated as:
Wikimedia Commons has media related to September 26. On This Day. BBC: On This Day. The New York Times: On This Day. Library of Congress: Today in History. History Channel (US): This Day in History. History Channel (UK): This Day in History. New Zealand Government: Today in New Zealand History Archived 2017-04-14 at the Wayback Machine ...
Under the Hanke–Henry Permanent Calendar January, February, April, May, July, August, October, and November have thirty days, while March, June, September, and December have thirty-one so that each quarter contains two 30-day months followed by one month of 31 days (30:30:31). While the Hanke–Henry Permanent Calendar changes the length of ...