The command to change the hour to 1:00 am on an AS/400 is:
CHGSYSVAL SYSVAL(QHOUR) VALUE('01')
To schedule this command to run at 2:00 am on October 27, use
the job scheduler. Key in WRKJOBSCDE
Then, hit F6 to add a new job. Fill in the values as:
Job name . . . . . . . . . . . . > FALLBACK Name, *JOBD
Command to run . . . . . . . . . > CHGSYSVAL SYSVAL(QHOUR) VALUE('01')
Frequency . . . . . . . . . . . *ONCE *ONCE, *WEEKLY, *MONT
Schedule date, or . . . . . . . 10/27/2002 Date, *CURRENT, *MONT
Schedule day . . . . . . . . . . *NONE *NONE, *ALL, *MON, *T
+ for more values
Schedule time . . . . . . . . . 02:00:00 Time, *CURRENT
I named my job FALLBACK and scheduled it to run once at 2:00 am on the
day that we set the clocks back.