Certain processor types support the definition of a logical time offset relative to the Sysplex Timer for a particular LPAR. In a sysplex environment this function allows multiple sysplexes with different time settings to run on the same CECs with the same Sysplex Timer.

The time-of-day for each LPAR is the UTC time adjusted by the logical offset value. In a multisystem environment, XCF will allow only images with the same logical offset value to participate in the same sysplex with one another. At IPL-time, XCF detects any inconsistent logical offset values and prevents the IPL-ing system from joining the sysplex.