Importance

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Abstract

To allow an AP which performs operation based on a time of a system clock and another AP which performs operation based on a user-specified time to be executed concurrently in a data processing unit with only one system clock without having to change the time of the system clock, virtual system time setting means 5 receive a command or job start date and/or time from an input/output unit 2 and store it in a virtual system time storage area 4. In response to a system date acquisition function 6 or a system time acquisition function 7 from a command or a job, virtual system time converting means return either the date of the system clock when the date is not stored in the virtual system time storage area 4 or the date stored in the date storage area when the date is stored therein. The means also return either the time of the system clock when the time is not stored in the virtual system time storage area or the time of said system clock plus the time stored in said time storage area when the time is stored therein.

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First Claim