8.3.3 Calendar dates and time intervals

Subtracting calendar dates yields time intervals. Time intervals have the following format:

c         integer datediff(4)
c
c           datediff(1) = # Days
c           datediff(2) = hhmmss
c           datediff(3) =      0
c           datediff(4) =     -1

Such time intervals can be added to or can be subtracted from calendar dates. Time intervals can be added to and be subtracted from each other.

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