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The algorithm for the day-of-week of 1 Jan can be proven using modulo arithmetic. The main point is that because 365 % 7 = 1, each year adds 1 day to the progression. The rest is adjustment for leap year. The century-based versions have 36525 % 7 = 6. The table of month offsets show a divergence in February due to the leap year.
A precise date is specified by the ISO week-numbering year in the format YYYY, a week number in the format ww prefixed by the letter 'W', and the weekday number, a digit d from 1 through 7, beginning with Monday and ending with Sunday. For example, the Gregorian date Wednesday, 22 January 2025 corresponds to day number 3 in the week number 04 ...
The first Sunday after December 21, 2024 is given by "{{Weekday after date|2024|December|21|Sunday}}" as "December 22, 2024". In the following table, 24 October 2010 is a Sunday. Syntax
Thus, for any date except February 29, the intervals between common years falling on a particular weekday are 6, 11, 11. See e.g. at the bottom of the page Common year starting on Monday the years in the range 1906–2091. For February 29 falling on a particular weekday, there is just one in every 28 years, and it is of course a leap year.
ISO 8601 is an international standard covering the worldwide exchange and communication of date and time-related data.It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]
Microsoft Excel displays the day before January 1, 1900 (the earliest date it can represent) as January 0, 1900. [17] It also treats 1900 incorrectly as a leap year (whereas only centuries divisible by 400 are), so it displays the day before March 1, 1900 as the non-existent February 29 instead of February 28. This means March 1, 1900 is the ...
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The weekday numbering follows ISO practice (Sunday → 0, Monday → 1, ... Saturday → 6). n: count numeric format, spelt out in full or abbreviated