tar: Combined date and time of day items

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1 7.5 Combined date and time of day items
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1 The ISO 8601 date and time of day extended format consists of an ISO
1 8601 date, a 'T' character separator, and an ISO 8601 time of day.  This
1 format is also recognized if the 'T' is replaced by a space.
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1    In this format, the time of day should use 24-hour notation.
1 Fractional seconds are allowed, with either comma or period preceding
1 the fraction.  ISO 8601 fractional minutes and hours are not supported.
1 Typically, hosts support nanosecond timestamp resolution; excess
1 precision is silently discarded.
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1    Here are some examples:
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1      2012-09-24T20:02:00.052-05:00
1      2012-12-31T23:59:59,999999999+11:00
1      1970-01-01 00:00Z
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