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(g77-300.info)Timer Wraparounds

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Timer Wraparounds
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   Intrinsics that return values computed from system timers, whether
elapsed (wall-clock) timers, process CPU timers, or other kinds of
timers, are prone to experiencing wrap-around errors (or returning
wrapped-around values from successive calls) due to insufficient ranges
offered by the underlying system's timers.

   Some of the symptoms of such behaviors include apparently negative
time being computed for a duration, an extremely short amount of time
being computed for a long duration, and an extremely long amount of
time being computed for a short duration.

   See the following for intrinsics known to have potential problems in
these areas on at least some systems: Note: CPU_Time Intrinsic, Note:
DTime Intrinsic (function), Note: DTime Intrinsic (subroutine),
Note: ETime Intrinsic (function), Note: ETime Intrinsic
(subroutine), Note: MClock Intrinsic, Note: MClock8 Intrinsic,
Note: Secnds Intrinsic, Note: Second Intrinsic (function), Note:
Second Intrinsic (subroutine), Note: System_Clock Intrinsic, Note:
Time Intrinsic (UNIX), Note: Time Intrinsic (VXT), Note: Time8
Intrinsic.