Honeywell TH8000 Series Operating Manual page 24

Operating Manual
Advanced functions About your new thermostat
Year setting (first two digits)
Function
Press s/t to change the first two digits of the year:
0120
Options: 20 = Year 20xx
21 = Year 21xx
Year setting (second two digits)
Function
Press s/t to change the last two digits of the year:
0130
Options: 01 - 99 (i.e., 2001 - 2099)
Month setting
Function
Press s/t to change the current month:
0140
Options: 01 - 12 (i.e., January - December)
Date setting
Function
Press s/t to change the current date:
0150
Options: 01 - 31