Atomic Clock Technology


AcuRite atomic clocks use a radio-controlled signal to synchronize to the correct time broadcast by the National Institute of Standards and Technology (NIST) Radio Station WWVB, located near Fort Collins, Colorado. WWVB broadcasts the current time and date with split-second accuracy. Atomic clocks set themselves and automatically adjust for daylight saving time (DST) to provide the most accurate timekeeping standard possible.


If your Atomic Clock:

  • Is inaccurate
  • Loses or gains time
  • Does not update after a power loss
  • Does not update for Daylight Savings Time
  • Does not sync with the Atomic Signal
  1. Check to make sure you have selected the correct time zone with the Daylight Savings Time set correctly for your location. (Most locations will require DST set to ON.) 
  2. Make sure you are using recommended batteries.
  3. If your unit does not appear to be searching for the Atomic Signal, search for a button labeled SIGNAL or REC, then press and hold it for 10 seconds. This will allow the unit to attempt to search for the Atomic Signal again. *All models may not have this button. If your model does not, proceed to step #4.
  4. An atomic unit should automatically correct itself with the date and time once it picks up the Atomic Signal. Try moving the unit to a window facing Colorado overnight (the signal is better at night) so it can gain a strong connection.
  5. If it continues to change, you may want to relocate the unit to a different location in your home, ensuring the clock is placed at least 10 feet away from other electronics.
  6. Lastly, we recommend resetting the unit using the appropriate reset in the following link:
    LCD Indoor Display and LED Clock Reset


For additional troubleshooting, please visit: