Press Feature and dial zero zero Press the left intercom button twice To set the time, press the pound (#) key and dial 103. Enter the correct time using a 24-hour clock (if it's afternoon, add 12 to the hour...i.e. 3pm is 1500) To set the date, press the pound key and dial 101. Enter the correct date using the format MMDDYY (two digit month, two digit day, two digit year). Press Feature and dial zero zero to save your changes.