Gnu/coreutils/Combined-date-and-time-of-day-items
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29.5 Combined date and time of day items
The ISO 8601 date and time of day extended format consists of an ISO
8601 date, a ‘T
’ character separator, and an ISO 8601 time of
day. This format is also recognized if the ‘T
’ is replaced by a
space.
In this format, the time of day should use 24-hour notation. Fractional seconds are allowed, with either comma or period preceding the fraction. ISO 8601 fractional minutes and hours are not supported. Typically, hosts support nanosecond timestamp resolution; excess precision is silently discarded.
Here are some examples:
2012-09-24T20:02:00.052-05:00 2012-12-31T23:59:59,999999999+11:00 1970-01-01 00:00Z