SETCLOCK

 

Providing a time zone spec is the only w ay to change the

 

system time and main tain both local and Univ ersal Time

 

(GMT) accurately. See the Operation Notes section for details.

GRADUAL

This option is meaningful only when the date and time

 

speci￿cations are pro vided. GRADUAL causes the system cloc k

 

to speed up or slo w down until the time change is completed,

 

at which time the system cloc k will resume its normal

 

pace. GRADUAL is the default for the Date-Time form of the

 

command.

NOW

This option is meaningful only when the date and time

 

speci￿cations are pro vided. NOW forces the change to be

 

immediate. See the w arning in the Operation Notes section

 

about the dangers of c hanging the system time immediately .

CANCEL

Cancels a current time correction. An y correction whic h has

 

already tak en place before the cancellation will remain; this

 

option does not undo a correction whic h has already been

 

accomplished. See the Operation Notes and Examples sections

 

for details.

Operation Notes

You can use the SETCLOCK command to change the system time or to c hange the system's time zone.

Changing the system time or time zone does not a￿ect an y interval timers in e￿ect. Thus, a PAUSE for a given time duration will main tain that same duration regardless of ho w the system time is c hanged.

Changing the system time or time zone will cause an y jobs streamed with a time speci￿cation (;A T=, ;DAY=, ;DATE= or ;IN=) to be in troduced in accordance with the newly-c hanged system time. Th us, a job streamed with ;AT=9:00 will be introduced when the changed system time is equal to 9:00.

You can use SETCLOCK to set a date and time, a time correction, or a time zone. The Date-Time form, the Correction form, and the Time Zone form are mutually exclusiv e; for instance, the user ma y not provide speci￿cations for both a time correction and a time zone in a single command.

MPE/iX Commands 2-239