NEC Xen Topaz Time Change

I’m sick of looking this up so I think I’ll post it here so next time it’s easy to find. This is how you change the system time on an NEC Xen Topaz phone system (PABX).

Press SPK
Dial 828
Dial two digits for the hour
Dial two digits for the minutes (00-60) in 24 hour time
Press SPK to hang up