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ISO 8601 describes a large number of date/time formats.

This profile may be adopted by standards which require an unambiguous representation of dates and times.

As different standards have their own requirements regarding granularity and flexibility, this profile offers a number of options.

An adopting standard must specify which of these options it permits.

Year: YYYY (eg 1997) Year and month: YYYY-MM (eg 1997-07) Complete date: YYYY-MM-DD (eg 1997-07-16) Complete date plus hours and minutes: YYYY-MM-DDThh:mm TZD (eg 1997-07-16T ) Complete date plus hours, minutes and seconds: YYYY-MM-DDThh:mm:ss TZD (eg 1997-07-16T ) Complete date plus hours, minutes, seconds and a decimal fraction of a second YYYY-MM-DDThh:mm:ss.s TZD (eg 1997-07-16T.45 ) YYYY = four-digit year MM = two-digit month (01=January, etc.) DD = two-digit day of month (01 through 31) hh = two digits of hour (00 through 23) (am/pm NOT allowed) mm = two digits of minute (00 through 59) ss = two digits of second (00 through 59) s = one or more digits representing a decimal fraction of a second TZD = time zone designator (Z or hh:mm or -hh:mm) This profile does not specify how many digits may be used to represent the decimal fraction of a second.