It's possible this action is only meant to work on a computer.
You may need to access the native functions of the Android phones and tablets and this might require acquiring a plugin or adding a cs script somewhere in your project and call its method.
Also, if getting time is important for your game as to deliver daily rewards, you absolutely need to use an external server to ping otherwise the user can trick the game.
Now this sounds complex but there are many solutions out there that actually provide easy ways to buy an almost already set up game server space with very setup required. You'll have to subscribe to a monthly payment though.
