Please see the pdf attachment listed below, for instructions to set the time on various DSC alarm panels.
For the current Powerseries PC1616/PC1832/PC1864, Alexor and 9047 alarm systems, follow these instructions:
Step 1 – Enter time/date programming by pressing [*] + [Master Code] + 
Step 2 – Enter [HH:MM] [MM/DD/YY]
Step 3 – Press [#] to exit
Note: Program the time using military standard (e.g. 8:00 pm = 20:00 hours). Master code is the Master User code (not installer code)