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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.
ISO 8601-1:2019 allows the T to be omitted in the extended format, as in "13:47:30", but only allows the T to be omitted in the basic format when there is no risk of confusion with date expressions. Either the seconds, or the minutes and seconds, may be omitted from the basic or extended time formats for greater brevity but decreased precision ...
If a date to be formatted is provided but no style is specified, the template emits a date in "d month yyyy" format, as it appears (for example) on discussion pages. When no date is specified, then the current date is emitted with no year, either in "d month" format for formatting style DMY , or in "month d" format for formatting styles MDY ...
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 ...
Ongoing maintenance of date formats may one day be carried out by bots on articles already tagged with templates ({{use dmy dates}} or {{use mdy dates}}) which help to identify the correct format. Potentially ambiguous dates, using slashes or full stops (6/7/1961, 12/07/1986, 6.7.1961, 12.07.1986) are re-appearing on some thousands of pages ...
Only the last, cumbersome, way does not give strange results in any user-specified date format. Since the date-formatting feature does not work well here one may choose not to use it in this case; that also gives the freedom to choose link targets exactly as desired, e.g.:
(Several forms of piped links override the date-formatting function.) Links to date ranges in the same calendar month, such as "[[December 13–17]]" or "the night of [[30/31 May]]" cause autoformatting to fail. The autoformatting mechanism will output such dates in a damaged form: 30/May 31, etc.
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.