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To make comparisons based on dates (e.g., if the current date and time is after some other date and time), first convert the time(s) to the number of seconds after January 1, 1970, using the function {{#time: U }}, then compare (or add, subtract, etc.) those numerical values.
Date and time notation around the world varies.. An approach to harmonize the different notations is the ISO 8601 standard.. Since the Internet is a main enabler of communication between people with different date notation backgrounds, and software is used to facilitate the communication, RFC standards and a W3C tips and discussion paper were published.
The use of date autoformatting presently available in Wikipedia is overloaded on the function of interwiki linking. [[May 1]], [[2000]] autoformats the date for registered users who have set a date preference, but it also (for all users) provides links to the pages May 1 and 2000.
The term year 2000 problem, or simply Y2K, refers to potential computer errors related to the formatting and storage of calendar data for dates in and after the year 2000. Many programs represented four-digit years with only the final two digits, making the year 2000 indistinguishable from 1900.
Note that, according to MOS:DATEUNIFY, dates in citations can be a different format from dates in the text as long as the citation date format is consistent and follows the rules in MOS:DATEUNIFY, even when a dates template specifies a specific article style. Automated date formatting tools generally do not account for this potential difference.
In communications messages, a date-time group (DTG) is a set of characters, usually in a prescribed format, used to express the year, the month, the day of the month, the hour of the day, the minute of the hour, and the time zone, if different from Coordinated Universal Time (UTC).
Formatting the cell as TEXT before entering ambiguous text prevents Excel from converting it. This issue has caused a well known problem in the analysis of DNA , for example in bioinformatics . As first reported in 2004, [ 87 ] genetic scientists found that Excel automatically and incorrectly converts certain gene names into dates.
All examples use example date 2021-03-31 / 2021 March 31 / 31 March 2021 / March 31, 2021 – except where a single-digit day is illustrated. Basic components of a calendar date for the most common calendar systems: D – day; M – month; Y – year; Specific formats for the basic components: yy – two-digit year, e.g. 24; yyyy – four-digit ...