(tar)Pure numbers in date strings

Authors of getdate

Relative item in date strings

Date input formats

Pure numbers in date strings
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   The precise intepretation of a pure decimal number is dependent of
the context in the date string.

   If the decimal number is of the form YYYYMMDD and no other calendar
date item (
FIXME: pxref Calendar date item
   ) appears before it in the date string, then YYYY is read as the
year, MM as the month number and DD as the day of the month, for the
specified calendar date.

   If the decimal number is of the form HHMM and no other time of day
item appears before it in the date string, then HH is read as the hour
of the day and MM as the minute of the hour, for the specified time of
the day.  MM can also be omitted.

   If both a calendar date and a time of day appear to the left of a
number in the date string, but no relative item, then the number
overrides the year.