coreutils: Pure numbers in date strings

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1 29.8 Pure numbers in date strings
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1 The precise interpretation of a pure decimal number depends on the
1 context in the date string.
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1    If the decimal number is of the form YYYYMMDD and no other calendar
1 date item (⇒Calendar date items) appears before it in the date
1 string, then YYYY is read as the year, MM as the month number and DD as
1 the day of the month, for the specified calendar date.
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1    If the decimal number is of the form HHMM and no other time of day
1 item appears before it in the date string, then HH is read as the hour
1 of the day and MM as the minute of the hour, for the specified time of
1 day.  MM can also be omitted.
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1    If both a calendar date and a time of day appear to the left of a
1 number in the date string, but no relative item, then the number
1 overrides the year.
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