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Revision and Date
If there are two dates, or there is a date and a revision, then
the date format is [+\-]YYMMDDHHMMSS with missing fields either
rounded up or rounded down.
Rounding is explicit if there is a "+" (rounds up) or a "-"
(rounds down) prefix on the date.
If there is no prefix, then the rounding is context sensitive.
If the date is the first date i.e., the starting point, then the
date is rounded down.
If it is the second date in the range, then it is rounded up.
So 98..98 is the same as 980101000000 .. 981231235959.
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