.You can manually set the time and day on the Honeywell thermostat. But only when the it has no internet connection. However when it does, it gets the time and day online. But without WiFi, you can. Thus, this piece details How to Change Time and Day on the Honeywell Wi Fi Thermostat RTH9580WF manually … Continue reading How to Change Time and Day on Honeywell Wi Fi Thermostat RTH9580WF