The time-of-day (TOD) clock service provides a caller, including your exit routine, with a TOD clock image. In the clock image, bit 0 is set on to allow the service to handle values from May 11,1971, at 11:56:53.685248 to January 25, 2114, at 11:50:41.055743. The system truncates partial microseconds and does no rounding.

Two services are provided, as described by the table below. The output from the service is dependent on whether the input to the service is an STCK or STCKE value.