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February 30, 1951, is the last night of the world in Ray Bradbury's short story "Last Night of the World". [22] June 31 is a fictional date in the Soviet film 31 June. It is also the date of a fictional RAF raid on Germany in Len Deighton's 1970 novel Bomber. December 32 or 32 December is the date of Hogswatchnight in Hogfather by Terry
Within 90 days of right now means less than or equal to 90 days from now. After 90 days from now means greater than 90 days from now. ←Baseball Bugs What's up, Doc? carrots→ 22:18, 7 September 2015 (UTC) I disagree. As per the above discussion. "Within" goes in both directions: 90 days plus and 90 days minus the central date in question.
Excel supports dates with years in the range 1900–9999, except that December 31, 1899, can be entered as 0 and is displayed as 0-jan-1900. Converting a fraction of a day into hours, minutes and days by treating it as a moment on the day January 1, 1900, does not work for a negative fraction. [86]
Although Excel allows display of up to 30 decimal places, its precision for any specific number is no more than 15 significant figures, and calculations may have an accuracy that is even less due to five issues: round off, [a] truncation, and binary storage, accumulation of the deviations of the operands in calculations, and worst: cancellation ...
If date A falls on the 31st of a month, then date A will be changed to the 30th. If date B falls on the 31st of a month, then date B will be changed to the 1st of the following month. Where date B falls on the last day of February, the actual date B will be used. All months are considered to last 30 days and hence a full year has 360 days.
The military date notation is similar to the date notation in British English but is read cardinally (e.g. "Nineteen July") rather than ordinally (e.g. "The nineteenth of July"). [citation needed] Weeks are generally referred to by the date of some day within that week (e.g., "the week of May 25"), rather than by a week number. Many holidays ...
This problem can be seen in the spreadsheet program Microsoft Excel as of 2023, which stores dates as the number of days since 31 December 1899 (day 1 is 1 January 1900) with a fictional leap day in 1900 if using the default 1900 date system. Alternatively, if using the 1904 date system, the date is stored as the number of days since 1 January ...
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.