To use original Minecraft time (20 minute cycle):
Open computer/smartphone -> settings -> check the real time checkbox.
When using real time, you can not use the "/time set" command.
This function is enabled by default when you install the mod.
To use real time (24 hour cycle):
Open computer/smartphone -> settings -> uncheck the real time checkbox.
NB! If the time is stuck as nighttime it is so because you are not living in London. The PTM real-time system uses your coordinates which are set by default to match the central London time. You can find your own specific coordinates using Google Maps (Click on your home street and the coordinates will appear in the bottom of the screen.) Change the default coordinates in your TransportMod-config file to match your ones.