Changing the Time on the Samsung Prostar 816 Telephone System
From any display telephone:
1. With the handset on-hook (hung up) dial #04.
the display will show MMC DISABLE
2. Dial the 4 digit passcode (usually 4321)
the display will show MMC ENABLED
3. Dial 1#
4. Dial #55
5. Enter the new date and time
YY = year (02 is 2002, 03 is 2002, etc.)
MM = month (01 is January, 02 is Februray, etc.)
DD = day of the month (01 is the 1st, 02 is the second, etc.)
W = day of the week (0 is Sunday, 1 is Monday, etc.)
HH = hours in military time (12 is noon, 13 is 1 p.m., etc.)
MM = minutes (00-59)
6. Dial # to store and exit.
The display should return to normal.
If this doesn't work, you may have an 816 plus.