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On 5 January 1975, the 12-bit field that had been used for dates in the TOPS-10 operating system for DEC PDP-10 computers overflowed, in a bug known as "DATE75". The field value was calculated by taking the number of years since 1964, multiplying by 12, adding the number of months since January, multiplying by 31, and adding the number of days since the start of the month; putting 2 12 − 1 ...
Microsoft Excel (using the default 1900 Date System) cannot display dates before the year 1900, although this is not due to a two-digit integer being used to represent the year: Excel uses a floating-point number to store dates and times. The number 1.0 represents the first second of January 1, 1900, in the 1900 Date System (or January 2, 1904 ...
The leap year problem (also known as the leap year bug or the leap day bug) is a problem for both digital (computer-related) and non-digital documentation and data storage situations which results from errors in the calculation of which years are leap years, or from manipulating dates without regard to the difference between leap years and common years.
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 ...
The preference settings that a registered user can choose are displayed in the second row. The year and the day-month combination are wikilinked separately, except for dates in the ISO 8601 format. Full date formats not found in the first column are not autoformatted when wikilinked, and are likely to produce a redlink; for instance,
The default display format is usually set by its initial content if not specifically previously set, so that for example "31/12/2007" or "31 Dec 2007" would default to the cell format of date. Similarly adding a % sign after a numeric value would tag the cell as a percentage cell format.
Month–year combinations, generally Month Year or Year Month should not be linked. Note: Most instances of "March NNN" are likely to be racing car designations, not date fragments. May 1968 is a redirect to May 1968 events in France and should be piped or changed to link to its target.
If an article uses a template such as {{Use mdy dates}} or {{Use dmy dates}}, then Citation Style 1 and 2 templates automatically render dates (|date=, |access-date=, |archive-date=, etc) in the specified format, regardless of the format they are entered in. (The |cs1-dates= parameter can be used to fine-tune the generated output, see Template ...