If your system is losing track of time, the cause might be a depleted or disconnected battery. To determine the status of your system battery, type the following diag command:
diag -B -c
When the Diagnostics main menu appears, select the Problem Determination option. If the battery is disconnected or depleted, a problem menu will be displayed with a service request number (SRN). Record the SRN on Item 4 of the Problem Summary Form and report the problem to your hardware service organization.
If your system battery is operational, your system time might have been reset incorrectly because either the date or setclock command was run incorrectly or unsuccessfully. Refer to Resetting the System Clock to correct the problem.