If you want a different Timecode value than the one of the internal realtime clock of the Tentacle, you can do so.
To set your Tentacle to a custom Timecode or set it to Time of the Day, you just open the Tentacle App for iOS or Android and connect the Tentacle (running in RED Mode) to your mobile device. If you need to know how to connect your Tentacle to a mobile device via Bluetooth go here. Once you have opened the App and see the interface of it, you can see a running Timecode in orange. Tip on the running Timecode and a window will pop up.
You can now set a custom Timecode and press "Set Custom Timecode". Seconds later the Tentacle will change into Green Mode and has taken over the custom Timecode. You can also press "Set to Phone Time" and the Tentacle will change into Green Mode as well and has the Time of Day from the country you are currently in. Now your Timecode on the display is green.