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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.
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.
The Lunar Hijri calendar ("Islamic calendar") is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. [ a ] 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 calendar year in most calendars.
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 ...
Besides that, in Hungary the big-endian year-month-day order has been traditionally used. In 1995, also in Germany, the traditional notation was replaced in the DIN 5008 standard, which defines common typographic conventions, with the ISO 8601 notation (e.g., "1991-12-31"), and is becoming the prescribed date format in Germany since 1996-05-01.
To find which day of the week Christmas Day of 2021 is, proceed as follows: in the year 2021, doomsday is on Sunday. Since December 12 is a doomsday, December 25, being thirteen days afterwards (two weeks less a day), fell on a Saturday. Christmas Day is always the day of the week before doomsday.
Note that all parameters default to the current date, so for example, the second set of parameters can be left out to calculate elapsed time since a past date: {{Age in years, months, weeks and days |month1 = 1 |day1 = 1 |year1 = 1 }} → 2023 years, 11 months, 2 weeks and 6 days