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[1] UTS #35: Unicode LDML: Dates (2015-09-17 07:19:07 +09:00 版) http://www.unicode.org/reports/tr35/tr35-dates.html#Date_Field_Symbol_Table

[3] UTS #35: Unicode LDML: Dates (2015-09-17 07:19:07 +09:00 版) http://www.unicode.org/reports/tr35/tr35-dates.html#Date_Format_Patterns

[4] Date/Time Patterns - CLDR - Unicode Common Locale Data Repository (2016-06-24 13:52:06 +09:00) http://cldr.unicode.org/translation/date-time-patterns

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[5] ICU が実装しています。 >>391

[8] 実質的に参照実装でしょう。

[391] Formatting Dates and Times - ICU Documentation, 2022-07-01T16:00:39.000Z, 2022-07-10T11:58:14.302Z https://unicode-org.github.io/icu/userguide/format_parse/datetime/#dateformat

[7] Apple の Cocoa (Mac OS X や iOS で使われている) で実装され、 Objective-C や Swift のようなプログラミング言語で使われています。 >>6

[6]

Date Formatters, 2021-10-29T17:46:37.000Z, 2022-06-21T09:14:07.042Z

https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/DataFormatting/Articles/dfDateFormatting10_4.html#%2F%2Fapple_ref%2Fdoc%2Fuid%2FTP40002369-SW13

To specify a custom fixed format for a date formatter, you use setDateFormat:. The format string uses the format patterns from the Unicode Technical Standard #35.

[2]

Model for Tabular Data and Metadata on the Web (2015-12-03 19:28:42 +09:00 版) http://www.w3.org/TR/2015/REC-tabular-data-model-20151217/#h-formats-for-dates-and-times

The supported date and time format patterns listed here are expressed in terms of the date field symbols defined in [UAX35]. These formats must be recognised by implementations and must be interpreted as defined in that specification. Implementations may additionally recognise other date format patterns. Implementations must issue a warning if the date format pattern is invalid or not recognised and proceed as if no date format pattern had been provided.

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