apple tv can't connect to the server at this time. please try later

Assuming this is not the first time you have used your Apple TV

1. You might try restarting the Apple TV by removing ALL the cables for 30 seconds.
2. Also try restarting the router. (Also try removing it’s power cord for at least 30 seconds)
3. If the problem persists, try a restore, you may want to try the previous procedures several times before doing this.
4. If restoring from the Apple TV doesn't help, try restoring from iTunes using a USB cable.

If this is a new Apple TV, in addition to trying the above, it may also be that your network router is not allowing access to the timeserver, check that your router allows access over port 123.

You might also try connecting to a different network and then trying again on your own, you might try at a friends or use the wifi hotspot on your mobile phone if you have one.

If your Apple TV fails to restore through iTunes……..

• Check that you have correctly followed the instructions for your model of Apple TV.
• If not already, try using a powered USB port.
• Repeat the process but this time try connecting the cable while iTunes is closed.
• Repeat the process with another cable.
• Try restoring the Apple TV on another computer in another location.

I suggested more than just trying with different cables. If you have tried all the things suggested, I recommend it is taken in to an AppleStore.