NEED TO CHANGE TIME ON THE PHONE...HELP

There a few different types of systems that work with that phone. I'm guessing that its either going to be a dk 40i or dk 280.
Leave the handset on hook, press intercom # 6 5 2, then enter the time of a 24 hour clock, entering 2 digits for the hour, 2 digits for the minutes, and 2 digits for the seconds – enter a leading 0 for any single digit entered, press Redial, press Speaker. This must be done at extension 10 – usually the receptionist phone. For example, if the time is 2:15 P.M., press intercom # 6 5 2, 1 4 1 5 0 0, Redial Speaker.