How do I switch between 12 hr and 24 hr time on my thermostat?

The following steps will allow you to switch between Standard and Military time:

1. Take the front cover off the thermostat off the wall. 
2. Look on the circuit board to find the dip switch table which tells you what the dip switches are for.  Look at row labeled “Time” for 24 HR or 12 HR.
3. The dip switches are the very small white protrusions on the top of the black vertical box just the right of the table.
4. There are a total of 8 dip switches labeled 1 thru 8.  The number text  is small and difficult to see.
5. To switch 12 HR to 24 HR,  Move dip switch #5  (the 5th one from the bottom) to the opposite position carefully with a fine-point pen, toothpick, or similar. 
6. Right = 12 Hour, Left = 24 Hour
7. Now press the Hardware Reset Button.  It is the small black button on the circuit board labeled “HW RST” to read the new setting.  There are 2 buttons, hit “HW RST” only.  (If you press SW RST, it will change your program back to the factory defaults).
8. Finally, put the front half of the thermostat back onto the wall.