For DCS, iDCS and OS7XXX series Samsung telephone systems.
Without lifting the handset, hit the transfer button and then dial 200. When asked for the passcode enter 1234. The display will show disabled, enter 1 to change it to enabled and hit the transfer button again.
Now hit the transfer button and dial 505. The display will show the current date and time in the top row and WMMDDYY:HHMM Enter the new information as follows
W = Day of the Week (1-7; the week begins on Monday and ends on Sunday)
MM = Month (1-12)
DD = Day of the month (01-31)
YY = Last two digits of the year
HH = Hour (use 24 hour clock)
MM = Minutes (00-59)
Hit the transfer Button to set the time and date. The phone system returns to normal operation.
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