RFC 3339 vs ISO 8601

RFC 3339ISO 8601By Mutual Agreement(e.g. agreement on six-digit years)2021-10-24 13:27:18Z2021-10-24 13:27:18.657Z2021-10-24_13:27:18Z2021-10-24_13:27:18.657Z2021-10-24T13:27:18-00:002021-10-2413:27:18Z13:27:18.657Z13:27:18-00:0013:27:18.657-00:002021-10-24T13:27:18Z2021-10-24T13:27:18.657Z2021-10-24t13:27:18z2021-10-24T13:27:18+00:002021-10-24t13:27:18+00:002021-10-24T13:27:18-00:002021-10-24T13:27:18.657-00:002021-10-24t13:27:18-00:002021-10-24T13:272021-1013:27:182021-10-24T13,42021-10-24T13.42021-10-24T13:27:182021-10-24T13:27,32021-10-24T13:27.3T13:27:18T13:27:18ZT13:27:18-00:00T13:27:18-0020212022022021-10-24T12:27:18−01:002021-2972021-297T13:272021-297T13:27:182021-297T13.42021-W422021-W42-72021-W42-7T13:272021-W42-7T13:27:182021-10-24T13:27:18.6572021/P2M2021-10/P2M2021-10-24/P2M2021-10-24T13/PT2M2021-10-24T13:27/PT2M2021-10-24T13:27:18/P3D2021-10-24T13:27:18/PT2M2021-297/P2M2021-W42/P2M2021-W42-7/P2M2021-297T13/PT2M2021-W42-7T13:27/PT2M2021-10/122021-297T13:27:18/PT3D2021-W42-7T13:27:18/PT2M2021-10-24/282021-10-24/2021-12-312021-10-24T13/232021-10-24T13:27/592021-10-24T13:27:18/59P1YP1,5YP1.5YP2MP2,5MP2.5MP1Y2MP1Y2,5MP1Y2.5MP1Y2.5MT4HR2/2021-297/P1Y2.5MT4HR/2021-W42-7T13/PT45M+0020+002021+002021-10+002021-10-24+002021-10-24T13+002021-10-24T13:27+002021-10-24T13:27:18+002021-W42-7T13+002021-W42-7T13:27+002021-297T13+002021-297T13:27+002021-297T13:27:18

Format Listing

Notes:

• This table is not exhaustive.
• Both standards are case-insensitive so every T, W, P, R, and Z could be t, w, p, r, or z respectively.
• RFC 3339 allows for other characters to replace the T but only gives examples using a space character.
• ISO 8601 allows decimal fractions of the smallest time value. These are represented here by a single fractional digit but the standard allows arbitrary precision.
• ISO 8601 prefers commas to dots for decimal separation but they are interchangeable in all formats.
• ISO 8601 recommends U+2212 MINUS "−" for timezones west of Greenwich. The formatter defaults to U+2D HYPHEN MINUS "-" which is valid under both standards.
• The format key is given below the table.

FormatNowRFC 3339ISO 8601Dates%Y-%M-%D2021-10-24✔️✔️%N2✔️%C20✔️%X202✔️%Y2021✔️%Y-%M2021-10✔️%Y-%O2021-297✔️%G-W%W2021-W42✔️%G-W%W-%w2021-W42-7✔️%Y%O2021297✔️%GW%W2021W42✔️%GW%W%w2021W427✔️Times%h:%m:%s-00:0013:27:18-00:00✔️%h:%m:%.3s-00:0013:27:18.657-00:00✔️%h:%m:%sZ13:27:18Z✔️✔️%h:%m:%.1sZ13:27:18.6Z✔️✔️%h:%m:%.3sZ13:27:18.657Z✔️✔️%h:%m:%s.%uZ13:27:18.657000Z✔️✔️%h:%m:%s+00:0013:27:18+00:00✔️✔️%h:%m:%.1s+00:0013:27:18.6+00:00✔️✔️%h:%m:%.3s+00:0013:27:18.657+00:00✔️✔️%h:%m:%s.%u+00:0013:27:18.657000+00:00✔️✔️%h:%m:%s%Z:%z13:27:18-00:00✔️✔️%h:%m:%.1s%Z:%z13:27:18.6-00:00✔️✔️%h:%m:%.3s%Z:%z13:27:18.657-00:00✔️✔️%h:%m:%s.%u%Z:%z13:27:18.657000-00:00✔️✔️%h13✔️%,1h13,4✔️%.1h13.4✔️%h:%m13:27✔️%h:%,1m13:27,3✔️%h:%.1m13:27.3✔️%h:%m:%s13:27:18✔️%h:%m:%,3s13:27:18,657✔️%h:%m:%.3s13:27:18.657✔️%h:%m:%s,%u13:27:18,657000✔️%h:%m:%s.%u13:27:18.657000✔️T%hT13✔️T%,1hT13,4✔️T%.1hT13.4✔️T%h:%mT13:27✔️T%h:%,1mT13:27,3✔️T%h:%.1mT13:27.3✔️T%h:%m:%sT13:27:18✔️T%h:%m:%,3sT13:27:18,657✔️T%h:%m:%.3sT13:27:18.657✔️T%h:%m:%s,%uT13:27:18,657000✔️T%h:%m:%s.%uT13:27:18.657000✔️%h%m1327✔️%h%,1m1327,3✔️%h%.1m1327.3✔️%h%m%s132718✔️%h%m%,3s132718,657✔️%h%m%.3s132718.657✔️%h%m%s,%u132718,657000✔️%h%m%s.%u132718.657000✔️T%h%mT1327✔️T%h%,1mT1327,3✔️T%h%.1mT1327.3✔️T%h%m%sT132718✔️T%h%m%,3sT132718,657✔️T%h%m%.3sT132718.657✔️T%h%m%s,%uT132718,657000✔️T%h%m%s.%uT132718.657000✔️%hZ13Z✔️%,1hZ13,4Z✔️%.1hZ13.4Z✔️%h:%mZ13:27Z✔️%h:%,1mZ13:27,3Z✔️%h:%.1mZ13:27.3Z✔️%h:%m:%,3sZ13:27:18,657Z✔️%h:%m:%s,%uZ13:27:18,657000Z✔️T%hZT13Z✔️T%,1hZT13,4Z✔️T%.1hZT13.4Z✔️T%h:%mZT13:27Z✔️T%h:%,1mZT13:27,3Z✔️T%h:%.1mZT13:27.3Z✔️T%h:%m:%sZT13:27:18Z✔️T%h:%m:%,3sZT13:27:18,657Z✔️T%h:%m:%.3sZT13:27:18.657Z✔️T%h:%m:%s,%uZT13:27:18,657000Z✔️T%h:%m:%s.%uZT13:27:18.657000Z✔️%h%mZ1327Z✔️%h%,1mZ1327,3Z✔️%h%.1mZ1327.3Z✔️%h%m%sZ132718Z✔️%h%m%,3sZ132718,657Z✔️%h%m%.3sZ132718.657Z✔️%h%m%s,%uZ132718,657000Z✔️%h%m%s.%uZ132718.657000Z✔️T%h%mZT1327Z✔️T%h%,1mZT1327,3Z✔️T%h%.1mZT1327.3Z✔️T%h%m%sZT132718Z✔️T%h%m%,3sZT132718,657Z✔️T%h%m%.3sZT132718.657Z✔️T%h%m%s,%uZT132718,657000Z✔️T%h%m%s.%uZT132718.657000Z✔️Date-Times%Y-%M-%D 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13/P1DT1H✔️%Y-%M-%DT%,1h/P1DT1H2021-10-24T13,4/P1DT1H✔️%Y-%M-%DT%.1h/P1DT1H2021-10-24T13.4/P1DT1H✔️%Y-%M-%DT%h:%m/P1DT1H2021-10-24T13:27/P1DT1H✔️%Y-%M-%DT%h:%,1m/P1DT1H2021-10-24T13:27,3/P1DT1H✔️%Y-%M-%DT%h:%.1m/P1DT1H2021-10-24T13:27.3/P1DT1H✔️%Y-%M-%DT%h:%m:%s/P1DT1H2021-10-24T13:27:18/P1DT1H✔️%Y-%M-%DT%h:%m:%,3s/P1DT1H2021-10-24T13:27:18,657/P1DT1H✔️%Y-%M-%DT%h:%m:%.3s/P1DT1H2021-10-24T13:27:18.657/P1DT1H✔️%Y-%M-%DT%h:%m:%s,%u/P1DT1H2021-10-24T13:27:18,657000/P1DT1H✔️%Y-%M-%DT%h:%m:%s.%u/P1DT1H2021-10-24T13:27:18.657000/P1DT1H✔️%G-W%W-%wT%h/P1DT1H2021-W42-7T13/P1DT1H✔️%G-W%W-%wT%,1h/P1DT1H2021-W42-7T13,4/P1DT1H✔️%G-W%W-%wT%.1h/P1DT1H2021-W42-7T13.4/P1DT1H✔️%G-W%W-%wT%h:%m/P1DT1H2021-W42-7T13:27/P1DT1H✔️%G-W%W-%wT%h:%,1m/P1DT1H2021-W42-7T13:27,3/P1DT1H✔️%G-W%W-%wT%h:%.1m/P1DT1H2021-W42-7T13:27.3/P1DT1H✔️%G-W%W-%wT%h:%m:%s/P1DT1H2021-W42-7T13:27:18/P1DT1H✔️%G-W%W-%wT%h:%m:%,3s/P1DT1H2021-W42-7T13:27:18,657/P1DT1H✔️%G-W%W-%wT%h:%m:%.3s/P1DT1H2021-W42-7T13:27:18.657/P1DT1H✔️%G-W%W-%wT%h:%m:%s,%u/P1DT1H2021-W42-7T13:27:18,657000/P1DT1H✔️%G-W%W-%wT%h:%m:%s.%u/P1DT1H2021-W42-7T13:27:18.657000/P1DT1H✔️%Y-%OT%h/P1DT1H2021-297T13/P1DT1H✔️%Y-%OT%,1h/P1DT1H2021-297T13,4/P1DT1H✔️%Y-%OT%.1h/P1DT1H2021-297T13.4/P1DT1H✔️%Y-%OT%h:%m/P1DT1H2021-297T13:27/P1DT1H✔️%Y-%OT%h:%,1m/P1DT1H2021-297T13:27,3/P1DT1H✔️%Y-%OT%h:%.1m/P1DT1H2021-297T13:27.3/P1DT1H✔️%Y-%OT%h:%m:%s/P1DT1H2021-297T13:27:18/P1DT1H✔️%Y-%OT%h:%m:%,3s/P1DT1H2021-297T13:27:18,657/P1DT1H✔️%Y-%OT%h:%m:%.3s/P1DT1H2021-297T13:27:18.657/P1DT1H✔️%Y-%OT%h:%m:%s,%u/P1DT1H2021-297T13:27:18,657000/P1DT1H✔️%Y-%OT%h:%m:%s.%u/P1DT1H2021-297T13:27:18.657000/P1DT1H✔️R/%Y-%M-%D/P1YR/2021-10-24/P1Y✔️R/%G-W%W-%w/P1YR/2021-W42-7/P1Y✔️R/%Y-%O/P1YR/2021-297/P1Y✔️R/%Y-%M-%D/%Y-%M-%DR/2021-10-24/2021-10-24✔️R/%Y-%M-%D/%G-W%W-%wR/2021-10-24/2021-W42-7✔️R/%Y-%M-%D/%Y-%OR/2021-10-24/2021-297✔️R/%G-W%W-%w/%Y-%M-%DR/2021-W42-7/2021-10-24✔️R/%G-W%W-%w/%G-W%W-%wR/2021-W42-7/2021-W42-7✔️R/%G-W%W-%w/%Y-%OR/2021-W42-7/2021-297✔️R/%Y-%O/%Y-%M-%DR/2021-297/2021-10-24✔️R/%Y-%O/%G-W%W-%wR/2021-297/2021-W42-7✔️R/%Y-%O/%Y-%OR/2021-297/2021-297✔️R10/%Y-%M-%D/P1YR10/2021-10-24/P1Y✔️R10/%G-W%W-%w/P1YR10/2021-W42-7/P1Y✔️R10/%Y-%O/P1YR10/2021-297/P1Y✔️R10/%Y-%M-%D/%Y-%M-%DR10/2021-10-24/2021-10-24✔️R10/%Y-%M-%D/%G-W%W-%wR10/2021-10-24/2021-W42-7✔️R10/%Y-%M-%D/%Y-%OR10/2021-10-24/2021-297✔️R10/%G-W%W-%w/%Y-%M-%DR10/2021-W42-7/2021-10-24✔️R10/%G-W%W-%w/%G-W%W-%wR10/2021-W42-7/2021-W42-7✔️R10/%G-W%W-%w/%Y-%OR10/2021-W42-7/2021-297✔️R10/%Y-%O/%Y-%M-%DR10/2021-297/2021-10-24✔️R10/%Y-%O/%G-W%W-%wR10/2021-297/2021-W42-7✔️R10/%Y-%O/%Y-%OR10/2021-297/2021-297✔️

Format Key

%N - Millennium
%C - Century
%X - Decade
%Y - Year
%M - Month
%D - Day
%G - 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 (ISO recommended)

Source on GitHub