As long as there is Internet connection, the controller will attempt to obtain time automatically from online when it reboots, and also every 24 hours after that. What version of controller do you have? WiFi or wired Ethernet? You can also set time manually if you go to Settings, empty out location (temporarily, you can always put it back afterwards), and in ‘Advanced Settings’, un-check “NTP sync”. Save settings, then the ‘Time’ should become editable, so you can set time manually that way.