RFC 3339 vs. ISO 8601

Comparison between some valid RFC 3339 and ISO 8601 date formats.

Format Listing

Notes:

• This table is not exhaustive.
• This page targets ISO 8601-1:2019. Previous editions and drafts contain key differences.
• ISO 8601-2:2019 contains additional representations including sub-year groupings (e.g. for seasons); grouped units; sets; uncertainty qualifications; and date arithmetic. These are not yet represented on this page.
• RFC 3339 suggests other characters could be specified to replace the T in downstream standards but only gives a space character as an example.
• RFC 3339 is case-insensitive so every T or Z could also be t or z respectively. Previous editions of ISO 8601 were also case-insensitive.
• ISO 8601 allows decimal fractions of the smallest time value. These are mostly represented here by a single fractional digit but the standard allows arbitrary precision.
• ISO 8601 allows commas and dots for decimal separation but they are interchangeable in all formats.
• ISO 8601-1:2019 permits omitting the T in the time of day representations (Times) when unambiguous.
  However, a T is always required in date and time of day representations (Date-Times).
  Previous editions also allowed omitting the T in Date-Times but it was never permitted to insert alternative characters (e.g. space or underscore).
• The format key is given below the table.

Format	Example	RFC 3339	ISO 8601
Dates
%Y-%M-%D	2021-07-27	✔️	✔️
%C	20		✔️
%X	202		✔️
%Y	2021		✔️
%Y-%M	2021-07		✔️
%Y-%O	2021-208		✔️
%V-W%W	2021-W30		✔️
%V-W%W-%w	2021-W30-2		✔️
%Y%M%D	20210727		✔️
%Y%O	2021208		✔️
%VW%W	2021W30		✔️
%VW%W%w	2021W302		✔️
Times
%h:%m:%s%Z:%z	22:20:32+08:00	✔️	✔️
%h:%m:%.1s%Z:%z	22:20:32.5+08:00	✔️	✔️
%h:%m:%.2s%Z:%z	22:20:32.55+08:00	✔️	✔️
%h:%m:%.3s%Z:%z	22:20:32.556+08:00	✔️	✔️
%h:%m:%s.%u%Z:%z	22:20:32.556000+08:00	✔️	✔️
%h:%m:%sZ	14:20:32Z	✔️	✔️
%h:%m:%.1sZ	14:20:32.5Z	✔️	✔️
%h:%m:%.2sZ	14:20:32.55Z	✔️	✔️
%h:%m:%.3sZ	14:20:32.556Z	✔️	✔️
%h:%m:%s.%uZ	14:20:32.556000Z	✔️	✔️
%h:%m:%s+00:00	14:20:32+00:00	✔️	✔️
%h:%m:%.1s+00:00	14:20:32.5+00:00	✔️	✔️
%h:%m:%.3s+00:00	14:20:32.556+00:00	✔️	✔️
%h:%m:%s.%u+00:00	14:20:32.556000+00:00	✔️	✔️
%h:%m:%s-00:00	14:20:32-00:00	✔️
%h:%m:%.1s-00:00	14:20:32.5-00:00	✔️
%h:%m:%.3s-00:00	14:20:32.556-00:00	✔️
%h:%m:%s.%u-00:00	14:20:32.556000-00:00	✔️
%h	22		✔️
%,1h	22,3		✔️
%.1h	22.3		✔️
%h:%m	22:20		✔️
%h:%,1m	22:20,5		✔️
%h:%.1m	22:20.5		✔️
%h:%m:%s	22:20:32		✔️
%h:%m:%.1s	22:20:32.5		✔️
%h:%m:%.2s	22:20:32.55		✔️
%h:%m:%,3s	22:20:32,556		✔️
%h:%m:%.3s	22:20:32.556		✔️
%h:%m:%s,%u	22:20:32,556000		✔️
%h:%m:%s.%u	22:20:32.556000		✔️
%hZ	14Z		✔️
%,1hZ	14,3Z		✔️
%.1hZ	14.3Z		✔️
%h:%mZ	14:20Z		✔️
%h:%,1mZ	14:20,5Z		✔️
%h:%.1mZ	14:20.5Z		✔️
%h:%m:%,3sZ	14:20:32,556Z		✔️
%h:%m:%s,%uZ	14:20:32,556000Z		✔️
%h%Z	22+08		✔️
%,1h%Z	22,3+08		✔️
%.1h%Z	22.3+08		✔️
%h:%m%Z	22:20+08		✔️
%h:%,1m%Z	22:20,5+08		✔️
%h:%.1m%Z	22:20.5+08		✔️
%h:%m:%s%Z	22:20:32+08		✔️
%h:%m:%.1s%Z	22:20:32.5+08		✔️
%h:%m:%.2s%Z	22:20:32.55+08		✔️
%h:%m:%,3s%Z	22:20:32,556+08		✔️
%h:%m:%.3s%Z	22:20:32.556+08		✔️
%h:%m:%s,%u%Z	22:20:32,556000+08		✔️
%h:%m:%s.%u%Z	22:20:32.556000+08		✔️
%h%Z:%z	22+08:00		✔️
%,1h%Z:%z	22,3+08:00		✔️
%.1h%Z:%z	22.3+08:00		✔️
%h:%m%Z:%z	22:20+08:00		✔️
%h:%,1m%Z:%z	22:20,5+08:00		✔️
%h:%.1m%Z:%z	22:20.5+08:00		✔️
%h:%m:%,3s%Z:%z	22:20:32,556+08:00		✔️
%h:%m:%s,%u%Z:%z	22:20:32,556000+08:00		✔️
T%h	T22		✔️
T%,1h	T22,3		✔️
T%.1h	T22.3		✔️
T%h:%m	T22:20		✔️
T%h:%,1m	T22:20,5		✔️
T%h:%.1m	T22:20.5		✔️
T%h:%m:%s	T22:20:32		✔️
T%h:%m:%.1s	T22:20:32.5		✔️
T%h:%m:%.2s	T22:20:32.55		✔️
T%h:%m:%,3s	T22:20:32,556		✔️
T%h:%m:%.3s	T22:20:32.556		✔️
T%h:%m:%s,%u	T22:20:32,556000		✔️
T%h:%m:%s.%u	T22:20:32.556000		✔️
T%hZ	T14Z		✔️
T%,1hZ	T14,3Z		✔️
T%.1hZ	T14.3Z		✔️
T%h:%mZ	T14:20Z		✔️
T%h:%,1mZ	T14:20,5Z		✔️
T%h:%.1mZ	T14:20.5Z		✔️
T%h:%m:%sZ	T14:20:32Z		✔️
T%h:%m:%.1sZ	T14:20:32.5Z		✔️
T%h:%m:%.2sZ	T14:20:32.55Z		✔️
T%h:%m:%,3sZ	T14:20:32,556Z		✔️
T%h:%m:%.3sZ	T14:20:32.556Z		✔️
T%h:%m:%s,%uZ	T14:20:32,556000Z		✔️
T%h:%m:%s.%uZ	T14:20:32.556000Z		✔️
T%h%Z	T22+08		✔️
T%,1h%Z	T22,3+08		✔️
T%.1h%Z	T22.3+08		✔️
T%h:%m%Z	T22:20+08		✔️
T%h:%,1m%Z	T22:20,5+08		✔️
T%h:%.1m%Z	T22:20.5+08		✔️
T%h:%m:%s%Z	T22:20:32+08		✔️
T%h:%m:%.1s%Z	T22:20:32.5+08		✔️
T%h:%m:%.2s%Z	T22:20:32.55+08		✔️
T%h:%m:%,3s%Z	T22:20:32,556+08		✔️
T%h:%m:%.3s%Z	T22:20:32.556+08		✔️
T%h:%m:%s,%u%Z	T22:20:32,556000+08		✔️
T%h:%m:%s.%u%Z	T22:20:32.556000+08		✔️
T%h%Z:%z	T22+08:00		✔️
T%,1h%Z:%z	T22,3+08:00		✔️
T%.1h%Z:%z	T22.3+08:00		✔️
T%h:%m%Z:%z	T22:20+08:00		✔️
T%h:%,1m%Z:%z	T22:20,5+08:00		✔️
T%h:%.1m%Z:%z	T22:20.5+08:00		✔️
T%h:%m:%s%Z:%z	T22:20:32+08:00		✔️
T%h:%m:%.1s%Z:%z	T22:20:32.5+08:00		✔️
T%h:%m:%.2s%Z:%z	T22:20:32.55+08:00		✔️
T%h:%m:%,3s%Z:%z	T22:20:32,556+08:00		✔️
T%h:%m:%.3s%Z:%z	T22:20:32.556+08:00		✔️
T%h:%m:%s,%u%Z:%z	T22:20:32,556000+08:00		✔️
T%h:%m:%s.%u%Z:%z	T22:20:32.556000+08:00		✔️
%h%m	2220		✔️
%h%,1m	2220,5		✔️
%h%.1m	2220.5		✔️
%h%m%s	222032		✔️
%h%m%.1s	222032.5		✔️
%h%m%.2s	222032.55		✔️
%h%m%,3s	222032,556		✔️
%h%m%.3s	222032.556		✔️
%h%m%s,%u	222032,556000		✔️
%h%m%s.%u	222032.556000		✔️
%h%mZ	1420Z		✔️
%h%,1mZ	1420,5Z		✔️
%h%.1mZ	1420.5Z		✔️
%h%m%sZ	142032Z		✔️
%h%m%.1sZ	142032.5Z		✔️
%h%m%.2sZ	142032.55Z		✔️
%h%m%,3sZ	142032,556Z		✔️
%h%m%.3sZ	142032.556Z		✔️
%h%m%s,%uZ	142032,556000Z		✔️
%h%m%s.%uZ	142032.556000Z		✔️
%h%m%Z	2220+08		✔️
%h%,1m%Z	2220,5+08		✔️
%h%.1m%Z	2220.5+08		✔️
%h%m%s%Z	222032+08		✔️
%h%m%.1s%Z	222032.5+08		✔️
%h%m%.2s%Z	222032.55+08		✔️
%h%m%,3s%Z	222032,556+08		✔️
%h%m%.3s%Z	222032.556+08		✔️
%h%m%s,%u%Z	222032,556000+08		✔️
%h%m%s.%u%Z	222032.556000+08		✔️
%h%Z%z	22+0800		✔️
%,1h%Z%z	22,3+0800		✔️
%.1h%Z%z	22.3+0800		✔️
%h%m%Z%z	2220+0800		✔️
%h%,1m%Z%z	2220,5+0800		✔️
%h%.1m%Z%z	2220.5+0800		✔️
%h%m%s%Z%z	222032+0800		✔️
%h%m%.1s%Z%z	222032.5+0800		✔️
%h%m%.2s%Z%z	222032.55+0800		✔️
%h%m%,3s%Z%z	222032,556+0800		✔️
%h%m%.3s%Z%z	222032.556+0800		✔️
%h%m%s,%u%Z%z	222032,556000+0800		✔️
%h%m%s.%u%Z%z	222032.556000+0800		✔️
T%h%m	T2220		✔️
T%h%,1m	T2220,5		✔️
T%h%.1m	T2220.5		✔️
T%h%m%s	T222032		✔️
T%h%m%.1s	T222032.5		✔️
T%h%m%.2s	T222032.55		✔️
T%h%m%,3s	T222032,556		✔️
T%h%m%.3s	T222032.556		✔️
T%h%m%s,%u	T222032,556000		✔️
T%h%m%s.%u	T222032.556000		✔️
T%h%mZ	T1420Z		✔️
T%h%,1mZ	T1420,5Z		✔️
T%h%.1mZ	T1420.5Z		✔️
T%h%m%sZ	T142032Z		✔️
T%h%m%.1sZ	T142032.5Z		✔️
T%h%m%.2sZ	T142032.55Z		✔️
T%h%m%,3sZ	T142032,556Z		✔️
T%h%m%.3sZ	T142032.556Z		✔️
T%h%m%s,%uZ	T142032,556000Z		✔️
T%h%m%s.%uZ	T142032.556000Z		✔️
T%h%m%Z	T2220+08		✔️
T%h%,1m%Z	T2220,5+08		✔️
T%h%.1m%Z	T2220.5+08		✔️
T%h%m%s%Z	T222032+08		✔️
T%h%m%.1s%Z	T222032.5+08		✔️
T%h%m%.2s%Z	T222032.55+08		✔️
T%h%m%,3s%Z	T222032,556+08		✔️
T%h%m%.3s%Z	T222032.556+08		✔️
T%h%m%s,%u%Z	T222032,556000+08		✔️
T%h%m%s.%u%Z	T222032.556000+08		✔️
T%h%Z%z	T22+0800		✔️
T%,1h%Z%z	T22,3+0800		✔️
T%.1h%Z%z	T22.3+0800		✔️
T%h%m%Z%z	T2220+0800		✔️
T%h%,1m%Z%z	T2220,5+0800		✔️
T%h%.1m%Z%z	T2220.5+0800		✔️
T%h%m%s%Z%z	T222032+0800		✔️
T%h%m%.1s%Z%z	T222032.5+0800		✔️
T%h%m%.2s%Z%z	T222032.55+0800		✔️
T%h%m%,3s%Z%z	T222032,556+0800		✔️
T%h%m%.3s%Z%z	T222032.556+0800		✔️
T%h%m%s,%u%Z%z	T222032,556000+0800		✔️
T%h%m%s.%u%Z%z	T222032.556000+0800		✔️
Date-Times
%Y-%M-%DT%h:%m:%sZ	2021-07-27T14:20:32Z	✔️	✔️
%Y-%M-%DT%h:%m:%.1sZ	2021-07-27T14:20:32.5Z	✔️	✔️
%Y-%M-%DT%h:%m:%.2sZ	2021-07-27T14:20:32.55Z	✔️	✔️
%Y-%M-%DT%h:%m:%.3sZ	2021-07-27T14:20:32.556Z	✔️	✔️
%Y-%M-%DT%h:%m:%s.%uZ	2021-07-27T14:20:32.556000Z	✔️	✔️
%Y-%M-%Dt%h:%m:%sz	2021-07-27t14:20:32z	✔️
%Y-%M-%Dt%h:%m:%.3sz	2021-07-27t14:20:32.556z	✔️
%Y-%M-%DT%h:%m:%s%Z:%z	2021-07-27T22:20:32+08:00	✔️	✔️
%Y-%M-%DT%h:%m:%.3s%Z:%z	2021-07-27T22:20:32.556+08:00	✔️	✔️
%Y-%M-%DT%h:%m:%s.%u%Z:%z	2021-07-27T22:20:32.556000+08:00	✔️	✔️
%Y-%M-%D %h:%m:%s%Z:%z	2021-07-27 22:20:32+08:00	✔️
%Y-%M-%D %h:%m:%.1s%Z:%z	2021-07-27 22:20:32.5+08:00	✔️
%Y-%M-%D %h:%m:%.2s%Z:%z	2021-07-27 22:20:32.55+08:00	✔️
%Y-%M-%D %h:%m:%.3s%Z:%z	2021-07-27 22:20:32.556+08:00	✔️
%Y-%M-%D %h:%m:%s.%u%Z:%z	2021-07-27 22:20:32.556000+08:00	✔️
%Y-%M-%D %h:%m:%sZ	2021-07-27 14:20:32Z	✔️
%Y-%M-%D_%h:%m:%sZ	2021-07-27_14:20:32Z	✔️
%Y-%M-%D %h:%m:%sz	2021-07-27 14:20:32z	✔️
%Y-%M-%D_%h:%m:%sz	2021-07-27_14:20:32z	✔️
%Y-%M-%D %h:%m:%.1sZ	2021-07-27 14:20:32.5Z	✔️
%Y-%M-%D %h:%m:%.2sZ	2021-07-27 14:20:32.55Z	✔️
%Y-%M-%D %h:%m:%.3sZ	2021-07-27 14:20:32.556Z	✔️
%Y-%M-%D_%h:%m:%.3sZ	2021-07-27_14:20:32.556Z	✔️
%Y-%M-%D %h:%m:%s.%uZ	2021-07-27 14:20:32.556000Z	✔️
%Y-%M-%D_%h:%m:%s.%uZ	2021-07-27_14:20:32.556000Z	✔️
%Y-%M-%D %h:%m:%.3sz	2021-07-27 14:20:32.556z	✔️
%Y-%M-%D_%h:%m:%.3sz	2021-07-27_14:20:32.556z	✔️
%Y-%M-%D %h:%m:%s.%uz	2021-07-27 14:20:32.556000z	✔️
%Y-%M-%D_%h:%m:%s.%uz	2021-07-27_14:20:32.556000z	✔️
%Y-%M-%D %h:%m:%s-00:00	2021-07-27 14:20:32-00:00	✔️
%Y-%M-%D %h:%m:%.3s-00:00	2021-07-27 14:20:32.556-00:00	✔️
%Y-%M-%DT%h:%m:%s-00:00	2021-07-27T14:20:32-00:00	✔️
%Y-%M-%DT%h:%m:%.3s-00:00	2021-07-27T14:20:32.556-00:00	✔️
%Y-%M-%DT%h:%m:%s+08:45	2021-07-27T23:05:32+08:45	✔️	✔️
%Y-%M-%DT%h:%m:%s+00:00	2021-07-27T14:20:32+00:00	✔️	✔️
%Y-%M-%DT%h:%m:%.3s+00:00	2021-07-27T14:20:32.556+00:00	✔️	✔️
%Y-%M-%DT%h	2021-07-27T22		✔️
%Y-%M-%DT%,1h	2021-07-27T22,3		✔️
%Y-%M-%DT%.1h	2021-07-27T22.3		✔️
%Y-%M-%DT%h:%m	2021-07-27T22:20		✔️
%Y-%M-%DT%h:%,1m	2021-07-27T22:20,5		✔️
%Y-%M-%DT%h:%.1m	2021-07-27T22:20.5		✔️
%Y-%M-%DT%h:%m:%s	2021-07-27T22:20:32		✔️
%Y-%M-%DT%h:%m:%.1s	2021-07-27T22:20:32.5		✔️
%Y-%M-%DT%h:%m:%.2s	2021-07-27T22:20:32.55		✔️
%Y-%M-%DT%h:%m:%,3s	2021-07-27T22:20:32,556		✔️
%Y-%M-%DT%h:%m:%.3s	2021-07-27T22:20:32.556		✔️
%Y-%M-%DT%h:%m:%s,%u	2021-07-27T22:20:32,556000		✔️
%Y-%M-%DT%h:%m:%s.%u	2021-07-27T22:20:32.556000		✔️
%Y-%M-%DT%hZ	2021-07-27T14Z		✔️
%Y-%M-%DT%,1hZ	2021-07-27T14,3Z		✔️
%Y-%M-%DT%.1hZ	2021-07-27T14.3Z		✔️
%Y-%M-%DT%h:%mZ	2021-07-27T14:20Z		✔️
%Y-%M-%DT%h:%,1mZ	2021-07-27T14:20,5Z		✔️
%Y-%M-%DT%h:%.1mZ	2021-07-27T14:20.5Z		✔️
%Y-%M-%DT%h:%m:%,3sZ	2021-07-27T14:20:32,556Z		✔️
%Y-%M-%DT%h:%m:%s,%uZ	2021-07-27T14:20:32,556000Z		✔️
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%Y-%M-%DT%h:%m:%.1s%Z	2021-07-27T22:20:32.5+08		✔️
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%Y-%M-%DT%h:%m:%,3s%Z	2021-07-27T22:20:32,556+08		✔️
%Y-%M-%DT%h:%m:%.3s%Z	2021-07-27T22:20:32.556+08		✔️
%Y-%M-%DT%h:%m:%s,%u%Z	2021-07-27T22:20:32,556000+08		✔️
%Y-%M-%DT%h:%m:%s.%u%Z	2021-07-27T22:20:32.556000+08		✔️
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%Y-%M-%DT%h:%m:%.1s%Z:%z	2021-07-27T22:20:32.5+08:00		✔️
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%VW%W%wT%h%m%,3s%Z	2021W302T222032,556+08		✔️
%VW%W%wT%h%m%.3s%Z	2021W302T222032.556+08		✔️
%VW%W%wT%h%m%s,%u%Z	2021W302T222032,556000+08		✔️
%VW%W%wT%h%m%s.%u%Z	2021W302T222032.556000+08		✔️
%VW%W%wT%h%Z%z	2021W302T22+0800		✔️
%VW%W%wT%,1h%Z%z	2021W302T22,3+0800		✔️
%VW%W%wT%.1h%Z%z	2021W302T22.3+0800		✔️
%VW%W%wT%h%m%Z%z	2021W302T2220+0800		✔️
%VW%W%wT%h%,1m%Z%z	2021W302T2220,5+0800		✔️
%VW%W%wT%h%.1m%Z%z	2021W302T2220.5+0800		✔️
%VW%W%wT%h%m%s%Z%z	2021W302T222032+0800		✔️
%VW%W%wT%h%m%.1s%Z%z	2021W302T222032.5+0800		✔️
%VW%W%wT%h%m%.2s%Z%z	2021W302T222032.55+0800		✔️
%VW%W%wT%h%m%,3s%Z%z	2021W302T222032,556+0800		✔️
%VW%W%wT%h%m%.3s%Z%z	2021W302T222032.556+0800		✔️
%VW%W%wT%h%m%s,%u%Z%z	2021W302T222032,556000+0800		✔️
%VW%W%wT%h%m%s.%u%Z%z	2021W302T222032.556000+0800		✔️
%Y%OT%h	2021208T22		✔️
%Y%OT%,1h	2021208T22,3		✔️
%Y%OT%.1h	2021208T22.3		✔️
%Y%OT%h%m	2021208T2220		✔️
%Y%OT%h%,1m	2021208T2220,5		✔️
%Y%OT%h%.1m	2021208T2220.5		✔️
%Y%OT%h%m%s	2021208T222032		✔️
%Y%OT%h%m%.1s	2021208T222032.5		✔️
%Y%OT%h%m%.2s	2021208T222032.55		✔️
%Y%OT%h%m%,3s	2021208T222032,556		✔️
%Y%OT%h%m%.3s	2021208T222032.556		✔️
%Y%OT%h%m%s,%u	2021208T222032,556000		✔️
%Y%OT%h%m%s.%u	2021208T222032.556000		✔️
%Y%OT%hZ	2021208T14Z		✔️
%Y%OT%,1hZ	2021208T14,3Z		✔️
%Y%OT%.1hZ	2021208T14.3Z		✔️
%Y%OT%h%mZ	2021208T1420Z		✔️
%Y%OT%h%,1mZ	2021208T1420,5Z		✔️
%Y%OT%h%.1mZ	2021208T1420.5Z		✔️
%Y%OT%h%m%sZ	2021208T142032Z		✔️
%Y%OT%h%m%.1sZ	2021208T142032.5Z		✔️
%Y%OT%h%m%.2sZ	2021208T142032.55Z		✔️
%Y%OT%h%m%,3sZ	2021208T142032,556Z		✔️
%Y%OT%h%m%.3sZ	2021208T142032.556Z		✔️
%Y%OT%h%m%s,%uZ	2021208T142032,556000Z		✔️
%Y%OT%h%m%s.%uZ	2021208T142032.556000Z		✔️
%Y%OT%h%Z	2021208T22+08		✔️
%Y%OT%,1h%Z	2021208T22,3+08		✔️
%Y%OT%.1h%Z	2021208T22.3+08		✔️
%Y%OT%h%m%Z	2021208T2220+08		✔️
%Y%OT%h%,1m%Z	2021208T2220,5+08		✔️
%Y%OT%h%.1m%Z	2021208T2220.5+08		✔️
%Y%OT%h%m%s%Z	2021208T222032+08		✔️
%Y%OT%h%m%.1s%Z	2021208T222032.5+08		✔️
%Y%OT%h%m%.2s%Z	2021208T222032.55+08		✔️
%Y%OT%h%m%,3s%Z	2021208T222032,556+08		✔️
%Y%OT%h%m%.3s%Z	2021208T222032.556+08		✔️
%Y%OT%h%m%s,%u%Z	2021208T222032,556000+08		✔️
%Y%OT%h%m%s.%u%Z	2021208T222032.556000+08		✔️
%Y%OT%h%Z%z	2021208T22+0800		✔️
%Y%OT%,1h%Z%z	2021208T22,3+0800		✔️
%Y%OT%.1h%Z%z	2021208T22.3+0800		✔️
%Y%OT%h%m%Z%z	2021208T2220+0800		✔️
%Y%OT%h%,1m%Z%z	2021208T2220,5+0800		✔️
%Y%OT%h%.1m%Z%z	2021208T2220.5+0800		✔️
%Y%OT%h%m%s%Z%z	2021208T222032+0800		✔️
%Y%OT%h%m%.1s%Z%z	2021208T222032.5+0800		✔️
%Y%OT%h%m%.2s%Z%z	2021208T222032.55+0800		✔️
%Y%OT%h%m%,3s%Z%z	2021208T222032,556+0800		✔️
%Y%OT%h%m%.3s%Z%z	2021208T222032.556+0800		✔️
%Y%OT%h%m%s,%u%Z%z	2021208T222032,556000+0800		✔️
%Y%OT%h%m%s.%u%Z%z	2021208T222032.556000+0800		✔️
%Y-%M-%DT%h:%m:%s+08	2021-07-27T22:20:32+08		✔️
%Y-%M-%DT%h-12	2021-07-27T02-12		✔️
%Y-%M-%DT%h-12:00	2021-07-27T02-12:00		✔️
%Y-%M-%DT%h:%m-12	2021-07-27T02:20-12		✔️
%Y-%M-%DT%h:%m-12:00	2021-07-27T02:20-12:00		✔️
Periods
P1Y	P1Y		✔️
P1,5Y	P1,5Y		✔️
P1.5Y	P1.5Y		✔️
P1M	P1M		✔️
P1W	P1W		✔️
P1D	P1D		✔️
PT1H	PT1H		✔️
P1H	P1H		✔️
PT1M	PT1M		✔️
PT1S	PT1S		✔️
P1S	P1S		✔️
PT1,5S	PT1,5S		✔️
PT1.5S	PT1.5S		✔️
P1Y1M	P1Y1M		✔️
P1Y1D	P1Y1D		✔️
P1Y1M1D	P1Y1M1D		✔️
P1Y1M1DT1H1M1S	P1Y1M1DT1H1M1S		✔️
P1DT1H	P1DT1H		✔️
P1MT1M	P1MT1M		✔️
P1DT1M	P1DT1M		✔️
P1.5W	P1.5W		✔️
P1,5W	P1,5W		✔️
P1DT1.000S	P1DT1.000S		✔️
P1DT1.00000S	P1DT1.00000S		✔️
P1DT1H1M1.1S	P1DT1H1M1.1S		✔️
P1H1M1.1S	P1H1M1.1S		✔️
Ranges
%Y-%M-%D/P1Y	2021-07-27/P1Y		✔️
%Y-%M-%D/P1M	2021-07-27/P1M		✔️
%Y-%M-%D/P1D	2021-07-27/P1D		✔️
%V-W%W-%w/P1Y	2021-W30-2/P1Y		✔️
%V-W%W-%w/P1M	2021-W30-2/P1M		✔️
%V-W%W-%w/P1D	2021-W30-2/P1D		✔️
%Y-%O/P1Y	2021-208/P1Y		✔️
%Y-%O/P1M	2021-208/P1M		✔️
%Y-%O/P1D	2021-208/P1D		✔️
%Y-%M-%D/%Y-%M-%D	2021-07-27/2021-07-27		✔️
%Y-%M-%D/%V-W%W-%w	2021-07-27/2021-W30-2		✔️
%Y-%M-%D/%Y-%O	2021-07-27/2021-208		✔️
%V-W%W-%w/%Y-%M-%D	2021-W30-2/2021-07-27		✔️
%V-W%W-%w/%V-W%W-%w	2021-W30-2/2021-W30-2		✔️
%V-W%W-%w/%Y-%O	2021-W30-2/2021-208		✔️
%Y-%O/%Y-%M-%D	2021-208/2021-07-27		✔️
%Y-%O/%V-W%W-%w	2021-208/2021-W30-2		✔️
%Y-%O/%Y-%O	2021-208/2021-208		✔️
P1Y/%Y-%M-%D	P1Y/2021-07-27		✔️
P1Y/%V-W%W-%w	P1Y/2021-W30-2		✔️
P1Y/%Y-%O	P1Y/2021-208		✔️
P1M/%Y-%M-%D	P1M/2021-07-27		✔️
P1M/%V-W%W-%w	P1M/2021-W30-2		✔️
P1M/%Y-%O	P1M/2021-208		✔️
P1D/%Y-%M-%D	P1D/2021-07-27		✔️
P1D/%V-W%W-%w	P1D/2021-W30-2		✔️
P1D/%Y-%O	P1D/2021-208		✔️
%Y-%M-%DT%h/P1DT1H	2021-07-27T22/P1DT1H		✔️
%Y-%M-%DT%h:%m/P1DT1H	2021-07-27T22:20/P1DT1H		✔️
%Y-%M-%DT%h:%m:%s/P1DT1H	2021-07-27T22:20:32/P1DT1H		✔️
%Y-%M-%DT%h:%m:%.3s/P1DT1H	2021-07-27T22:20:32.556/P1DT1H		✔️
%Y-%M-%DT%h:%mZ/P1DT1H	2021-07-27T22:20Z/P1DT1H		✔️
%V-W%W-%wT%h/P1DT1H	2021-W30-2T22/P1DT1H		✔️
%V-W%W-%wT%h:%m/P1DT1H	2021-W30-2T22:20/P1DT1H		✔️
%V-W%W-%wT%h:%m:%s/P1DT1H	2021-W30-2T22:20:32/P1DT1H		✔️
%V-W%W-%wT%h:%m:%.3s/P1DT1H	2021-W30-2T22:20:32.556/P1DT1H		✔️
%V-W%W-%wT%h:%mZ/P1DT1H	2021-W30-2T22:20Z/P1DT1H		✔️
%Y-%OT%h/P1DT1H	2021-208T22/P1DT1H		✔️
%Y-%OT%h:%m/P1DT1H	2021-208T22:20/P1DT1H		✔️
%Y-%OT%h:%m:%s/P1DT1H	2021-208T22:20:32/P1DT1H		✔️
%Y-%OT%h:%m:%.3s/P1DT1H	2021-208T22:20:32.556/P1DT1H		✔️
%Y-%OT%h:%mZ/P1DT1H	2021-208T22:20Z/P1DT1H		✔️
P1DT1H/%Y-%M-%DT%h	P1DT1H/2021-07-27T22		✔️
P1DT1H/%Y-%M-%DT%h:%m	P1DT1H/2021-07-27T22:20		✔️
P1DT1H/%Y-%M-%DT%h:%m:%s	P1DT1H/2021-07-27T22:20:32		✔️
P1DT1H/%Y-%M-%DT%h:%m:%.3s	P1DT1H/2021-07-27T22:20:32.556		✔️
P1DT1H/%Y-%M-%DT%h:%mZ	P1DT1H/2021-07-27T14:20Z		✔️
P1DT1H/%V-W%W-%wT%h	P1DT1H/2021-W30-2T22		✔️
P1DT1H/%V-W%W-%wT%h:%m	P1DT1H/2021-W30-2T22:20		✔️
P1DT1H/%V-W%W-%wT%h:%m:%s	P1DT1H/2021-W30-2T22:20:32		✔️
P1DT1H/%V-W%W-%wT%h:%m:%.3s	P1DT1H/2021-W30-2T22:20:32.556		✔️
P1DT1H/%V-W%W-%wT%h:%mZ	P1DT1H/2021-W30-2T14:20Z		✔️
P1DT1H/%Y-%OT%h	P1DT1H/2021-208T22		✔️
P1DT1H/%Y-%OT%h:%m	P1DT1H/2021-208T22:20		✔️
P1DT1H/%Y-%OT%h:%m:%s	P1DT1H/2021-208T22:20:32		✔️
P1DT1H/%Y-%OT%h:%m:%.3s	P1DT1H/2021-208T22:20:32.556		✔️
P1DT1H/%Y-%OT%h:%mZ	P1DT1H/2021-208T14:20Z		✔️
R/%Y-%M-%D/P1Y	R/2021-07-27/P1Y		✔️
R/%V-W%W-%w/P1Y	R/2021-W30-2/P1Y		✔️
R/%Y-%O/P1Y	R/2021-208/P1Y		✔️
R/%Y-%M-%D/%Y-%M-%D	R/2021-07-27/2021-07-27		✔️
R/%Y-%M-%D/%V-W%W-%w	R/2021-07-27/2021-W30-2		✔️
R/%Y-%M-%D/%Y-%O	R/2021-07-27/2021-208		✔️
R/%V-W%W-%w/%Y-%M-%D	R/2021-W30-2/2021-07-27		✔️
R/%V-W%W-%w/%V-W%W-%w	R/2021-W30-2/2021-W30-2		✔️
R/%V-W%W-%w/%Y-%O	R/2021-W30-2/2021-208		✔️
R/%Y-%O/%Y-%M-%D	R/2021-208/2021-07-27		✔️
R/%Y-%O/%V-W%W-%w	R/2021-208/2021-W30-2		✔️
R/%Y-%O/%Y-%O	R/2021-208/2021-208		✔️
R10/%Y-%M-%D/P1Y	R10/2021-07-27/P1Y		✔️
R10/%V-W%W-%w/P1Y	R10/2021-W30-2/P1Y		✔️
R10/%Y-%O/P1Y	R10/2021-208/P1Y		✔️
R10/%Y-%M-%D/%Y-%M-%D	R10/2021-07-27/2021-07-27		✔️
R10/%Y-%M-%D/%V-W%W-%w	R10/2021-07-27/2021-W30-2		✔️
R10/%Y-%M-%D/%Y-%O	R10/2021-07-27/2021-208		✔️
R10/%V-W%W-%w/%Y-%M-%D	R10/2021-W30-2/2021-07-27		✔️
R10/%V-W%W-%w/%V-W%W-%w	R10/2021-W30-2/2021-W30-2		✔️
R10/%V-W%W-%w/%Y-%O	R10/2021-W30-2/2021-208		✔️
R10/%Y-%O/%Y-%M-%D	R10/2021-208/2021-07-27		✔️
R10/%Y-%O/%V-W%W-%w	R10/2021-208/2021-W30-2		✔️
R10/%Y-%O/%Y-%O	R10/2021-208/2021-208		✔️

Format Key

%L - Millennium
%C - Century
%X - Decade
%Y - Year
%M - Month
%D - Day
%V - Week Year
%W - Week
%w - Week Day
%O - Ordinal Day
%h - Hour
%m - Minute
%s - Second
%u - Microsecond
%Z - Zone Hour including +/-
%z - Zone Minute
%[,.]3x - Value including fraction with given precision, using either comma or dot.
%−Z     - Use U+2212 for negative timezone hours