A quick and dirty crosswalk of an unknown date(time) input to EML that really
only works for ISO8601 input. All other formats will fail and be returned
as-is as a calendarDate
. From there the user will need to do a conversion
themselves.
crosswalk_datetime(input)
(character) Some unknown date(time) input
(list) A list
with members calendarDate
and time
. time
will
be NULL
if parsing fails or if the time string inside input
isn't
ISO8601