AUTORESETTIME

The AUTORESETTIME system initialization parameter specifies the action CICS® takes for automatic time changes.

Defining AUTORESETTIME

You can define the AUTORESETTIME system initialization parameter in the following ways:

On the PARM parameter of the EXEC PGM=DFHSIP statement
In the SYSIN data set of the CICS start up job stream
Through the system console
In the DFHSIT macro

For more information, see Effect of daylight saving time changes.

Values for AUTORESETTIME

AUTORESETTIME={IMMEDIATE|NO|YES}

Valid values for the AUTORESETTIME system initialization parameter are as follows:

IMMEDIATE: IMMEDIATE is the default value for AUTORESETTIME. CICS issues a PERFORM RESET command to synchronize the CICS time-of-day with the system time-of-day if, at the next task attach, the CICS time-of-day differs from the system time-of-day. CICS issues message DFHIC0801 when the times are synchronized.
NO: CICS issues message DFHAP1500 to indicate that a CEMT PERFORM RESET command is required to synchronize the CICS time-of-day with the system time-of-day.
YES: CICS issues a PERFORM RESET command to synchronize the CICS time-of-day with the system time-of-day if, at the next local midnight, the CICS time-of-day differs from the system time-of-day by more than 30 minutes. For example, setting clocks forward or back to adjust for summer and winter time. CICS issues message DFHIC0801 when the times are synchronized.
Note: Setting clocks back might cause end-of-day statistics to be written twice.

Recommendation: To ensure that the correct local time is used by all CICS functions, use the CEMT PERFORM RESET command immediately whenever you alter the system date or the time-of-day in the z/OS® TOD clock while a CICS region is running.