The precise interpretation of a pure decimal number depends
on the context in the date string.
If the decimal number is of the form yyyymmdd and no
other calendar date item (see Calendar date items) 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 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.
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