| 摘要 |
<p>PROBLEM TO BE SOLVED: To acquire properly corrected system time without changing a calendar clock in a subsystem itself. SOLUTION: A system time informing means 13 built in a main system 1 periodically acquires current system time from a calendar clock 12 and informs respective subsystems 2 of the current system time. A time correction means 22 built in each subsystem 2 acquires a local calendar clock 21 to be corrected and stores a system time correction value consisting of a difference from the system time informed by the main system 1 in a shared table 25. A system time acquiring means 27 built in the subsystem 2 acquires the local calendar clock 21 at the time of receiving a time acquiring request from an operation program 26, and while taking account of the system time correction value stored in the table 25, provides the corrected time as a current system time.</p> |
