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For determination of the day of the week (1 January 2000, Saturday) the day of the month: 1 ~ 31 (1) the month: (6) the year: (0) the century mod 4 for the Gregorian calendar and mod 7 for the Julian calendar (0). adding 1+6+0+0=7. Dividing by 7 leaves a remainder of 0, so the day of the week is Saturday. The formula is w = (d + m + y + c) mod 7.
Applying the Doomsday algorithm involves three steps: determination of the anchor day for the century, calculation of the anchor day for the year from the one for the century, and selection of the closest date out of those that always fall on the doomsday, e.g., 4/4 and 6/6, and count of the number of days between that date and the date in ...
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 Friday, 21 February 2025 corresponds to day number 5 in the week number 08 of ...
Day–month–year (DMY) format—e.g., 12 January 2025 or 12 Jan 2025; Month–day–year (MDY) format—e.g., January 12, 2025 or Jan 12, 2025 ; Year–month–day (YMD) format—e.g., 2025-01-12 (also called the "all-numeric" format; used only where space is limited, such as in references and some tables and infoboxes, but not in article ...
An example of a date picker in use. When the user clicks on the entry field, a calendar pops up below. A date picker, popup calendar, date and time picker, or time picker is a graphical user interface widget which allows the user to select a date from a calendar and/or time from a time range.
[17] The separator used between date values (year, month, week, and day) is the hyphen, while the colon is used as the separator between time values (hours, minutes, and seconds). For example, the 6th day of the 1st month of the year 2009 may be written as "2009-01-06" in the extended format or as "20090106" in the basic format without ambiguity.
The term Julian date may also refer, outside of astronomy, to the day-of-year number (more properly, the ordinal date) in the Gregorian calendar, especially in computer programming, the military and the food industry, [10] or it may refer to dates in the Julian calendar. For example, if a given "Julian date" is "October 5, 1582", this means ...
The expanded form of the date (e.g., 31. Dezember 1991) continues to use the little-endian order and the ordinal-number dot for the day of the month. Week numbers according to ISO 8601 and the convention of starting the week on Monday were introduced in the mid 1970s .