Page "Calendar date" Paragraph 23
from
Wikipedia
It is also extended through the universal big-endian format clock time: 9 November 2003, 18h 14m 12s, or 2003 / 11 / 9 / 18: 14: 12 or ( ISO 8601 ) 2003-11-09T18: 14: 12.
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1.844 seconds.