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The ISO week date system is effectively a leap week calendar system that is part of the ISO 8601 date and time ... (1 ⁄ 12 year) average at exactly 4.348125 weeks ...
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 January 2025" is ten days after "15 January 2025". The date of a particular event depends on the observed time zone.
In traditional American usage, dates are written in the month–day–year order (e.g. January 24, 2025) with a comma before and after the year if it is not at the end of a sentence [2] and time in 12-hour notation (12:27 am). International date and time formats typically follow the ISO 8601 format (2025-01-24) for all-numeric dates, [3] write ...
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The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.
January 14: Ratification Day in the United States Poster for the premiere of Tosca 1301 – King Andrew III died without any male heirs, ending the Árpád dynasty , which had ruled Hungary since the late 9th century.
December 12 is the 346th day of the year (347th in leap years) in the Gregorian calendar; 19 days remain until the end of the year. Events. Pre-1600 627 – ...
The day of the week can be easily calculated given a date's Julian day number (JD, i.e. the integer value at noon UT): Adding one to the remainder after dividing the Julian day number by seven (JD modulo 7 + 1) yields that date's ISO 8601 day of the week. For example, the Julian day number of 24 January 2025 is 2460700.