The Valid Time app for Windows Phone shows the time difference between phone clock and realtime clock. The realtime is read from internet time servers. The difference is displayed prominently.

The app is simple but useful and people seem to like it.

Privacy note: The app gets the current time from internet time servers. That's why it needs an internet connection.

  • Connect to timeserver and read realtime
  • Display difference between realtime and phone time
  • Dynamic Live Tile that shows the number of minutes the clock is off     @h_ulbricht