HTML Datetime Formats Table

Datetime Attribute Formats
Type	Format	Example Strings	Description
Year	`YYYY` `Y` - year digit	`1917`	The year A.D. 1917
Month	`YYYY-MM` `Y` - year digit `M` - month digit	`1917-10`	October of A.D. 1917
Week	`YYYY-Www` `Y` - year digit `W` - week indicator `w` - week digit	`1917-W42`	The 42nd week of A.D. 1917
Date	`YYYY-MM-DD` `Y` - year digit `M` - month digit `D` - day digit	`1776-07-04`	July 4, A.D. 1776
Local Date and Time	`YYYY-MM-DDThh:mm:ssd` `Y` - year digit `M` - month digit `D` - day digit `T` or space - time indicator `h` - hour digit `m` - minute digit `s` - second digit `d` - optional decimal portion	`1917-10-13T12:00:34.742` `1917-10-13 12:00:34.742`	October 13, A.D. 1917 at 34.742 seconds after 12 p.m.
Global Date and Time	`YYYY-MM-DDThh:mm:ssdz` `Y` - year digit `M` - month digit `D` - day digit `T` or space - time indicator `h` - hour digit `m` - minute digit `s` - second digit `d` - optional decimal portion `z` - time zone	`1917-10-13T12:00:00Z` `1917-10-13T12:00:00-05:00` `1917-10-13T12:00:00-0400`	October 13, A.D. 1917 at 12 p.m. Greenwich Mean Time October 13, A.D. 1917 at 12 p.m. Eastern Standard Time October 13, A.D. 1917 at 12 p.m. Eastern Daylight Time
Time	`hh:mm:ssd` `h` - hour digit `m` - minute digit `s` - second digit `d` - optional decimal portion	`00:05:23.94`	5 minutes and 23.94 seconds after midnight
Day	`MM-DD` `M` - month digit `D` - day digit	`04-24`	April 24th
Period of Time	`(-)PxYxMxDTxHxMxS` `(-)` - optional negative `P` - period indicator `Y` - year indicator `M` - month indicator `D` - day indicator `T` - time indicator `H` - hour indicator `M` - minute indicator `S` - second indicator	`P10D` `PT1H30M` `-PT15S` `P2Y3MT5H40S` `P3M` `PT3M` `P10DT3H15M`	10 days 1 hour and 30 minutes -15 seconds 2 years, 3 months, 5 hours, and 40 seconds 3 months 3 minutes 10 days, 3 hours, and 15 minutes