Honeywell TH2110 Operating Manual page 9

Set the clock
Press the Set button. Set Time will appear on the screen and the time
display will flash.
Press the or
Press the Set button again. Set Day will flash on the screen.
Press the or
Press the Run button to save the changes & exit. (The changes are also
saved if you do not press any button for 60 seconds.)
NOTE: The clock has lost its settings when the time display flashes. If the
thermostat is following the schedule, it will use the temperature settings
programmed for the Wake period of the weekdays until you readjust the clock.
button to set the time.
button to select the day of the week.
5
PRO 2000 Series
Set Time
Set Day