Test whether a string matches the ISO date format.
Decides whether a string is a definitively meant to be an ISO8601 date. Uses a slightly stricter format than the spec so that you will never get false positives from a string id (e.g.
isostring('2012-12-30') // trueisostring('2012'); // falseisostring('2012-12-30T20:12:22.222222-08:00') // true
(The MIT License)
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