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For example, the Gregorian date Wednesday, 15 January 2025 corresponds to day number 3 in the week number 03 of 2025, and is written as 2025-W03-3 (in extended form) or 2025W033 (in compact form). The ISO year is slightly offset to the Gregorian year; for example, Monday 30 December 2019 in the Gregorian calendar is the first day of week 1 of ...
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Sunday 3 January 2010 is written "2009-W53-7" ... the value for the number of calendar months. W is the week designator that follows ... such as week numbers and ...
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Business and economy China and the Association of Southeast Asian Nations (ASEAN) launch a Free Trade Area. (New York Times) (Xinhua) Disasters and accidents At least 19 people are dead and five are injured as mudslide hits an island resort near Angra dos Reis, Ilha Grande. Large numbers also killed elsewhere in Brazil. (BBC) (The Washington Post) Health A study suggests that teenagers who go ...
Leap years have two letters, so for January and February calculate the day of the week for January 1 and for March to December calculate the day of the week for October 1. Leap years are all years that divide exactly by four, with the following exceptions: Gregorian calendar – all years divisible by 100, except those that divide exactly by 400.
As the Julian calendar repeats after 28 years that means it will also repeat after 700 years, i.e. 25 cycles. The year's position in the cycle is given by the formula ((year + 8) mod 28) + 1). Years 3, 14 and 20 of the cycle are common years beginning on Thursday. 2017 is year 10 of the cycle.
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.