Help Centerhttps://www.youtube.com/watch?v=gQ_8gcrsXPg
To change the date and time from the keypad select the master code "default is 1234", #, 6, 3, enter hour, add, select am or pm, add, enter minutes, add, select month, add, select day, add, select year, add and now you have changed the date and time on the Honeywell L3000 wireless system.