Honeywell RTH7600D Touchscreen 7-Day Programmable Thermostat "thermostat rth7600" Questions

How do I change the date on my thermostats rth7600 after it is programmed. I clicked the wrong date RTH7600D 7 Day Programmable Thermostat get manual and follow instraction

...RTH7600 with a Rheem RHSLHM3017JA and 13PJL30A01. It worked fine in the summer but now its blowing cold are except for when it has AUX on the display. I hear the outside unit on outside making a lot ...