The clock does not show the correct time.

http://www.worldtimeserver.com/atomic-clock/

If you know how much wrong the clock was set, ie.
The clock was 1999-01-01 14:37 but it should have been 2017-05-22 19:00, there are softwares that could correct this error for a directory of files.

just search for exif time offset correct software (exif is the files hidden information about the photo)

If you have an atomic clock/watch that is not showing the right time, you could have one or two separate problems. First, the clock may not be set for the correct time zone. Second, the clock may have a manual switch to adjust the time for daylight savings time. Each of these problems can make your clock display the incorrect hour of the time, especially after you change the batteries and your clock "forgets" some or all of its prior settings.
Check the back of your clock to see if there is a button or switch to set the correct time zone. If your clock appears to be set to your time zone, change the switch to another time zone and see whether the clock moves forward/backward to adjust. Once it has finished adjusting to the new time zone, adjust the clock back to your time zone to see whether it will now correctly reset to display the time.
I have seen atomic clocks that have manual adjustments for these settings as well as ones that adjust automatically other than the time zone. If you provide the manufacturer and model number of your clock, we should be able to provide more detailed instructions.

unplug the clock radio from the power, take out the back up battery ( if it has one). let it set for 60 seconds or so, plug it back in, It should now be flashing 12:00 over and over. now reset the clock to the correct time and date.

http://www.emersonelectronics.ca/emerson/documents/CKS3029C%20-%20SmartSet%20Dual%20Alarm%20Clock%20Radio%20addendum%20English.pdf

If you change the BIOS date and time and when you boot up next time and the date and time has changed back or is incorrect, then the most likely fault is a flat BIOS battery. Replace the BIOS battery, it maybe a coin type lithium 3volt battery. this is the most common type used in motherboards is a CR2030 lithium battery.

Try changing the batteries in the CLOCK. I had the same problem in a 3M similar clock and it didn't read the transmitter correctly or eventually, at all, when the CLOCK batteries were getting low.

For the Sharp SPC374T Atomic Clock - Time Zone setting- Press the 'Time' button once, the time zone will show where 'Day' usually is, use the Up or Down buttong to adjust.

For the outdoor Thermo, credit to my neighbor for this one. Remove battery from main unit, wait 2-3 minutes. Reload batteries. Once you get a reading from the outdoor sensor, hit the reset on the main unit. You will have to reset the time zone as described above, but this worked for me after 10 months of no outside temp showing up!

Good luck,
Doc

RESETTING THE CLOCK AFTER A TOTAL MEMORY LOSS

If you do not change the built in lithium battery within a reasonable period of time after you see the ‘flashing’ LOW BATT. warning indicator, the lithium battery may become exhausted and will no longer be able to supply back up power to the SmartSet internal computer.

If the unit is disconnected from the AC outlet after the battery is exhausted, or if a power interruption occurs, the SmartSet memory will be lost and the clock will need to be reset when the power is restored. Be sure to install a fresh lithium battery before you reset the clock, otherwise the clock will need to be reset each time the power is interrupted.

If the lithium battery is exhausted and you experience an interruption in the AC power supply, the clock will reset itself to its initial default setting when the power is restored.

The initial default setting is “12:00 AM, Saturday, January 1
(1 1), 2005”.

If you notice that the time on your SmartSet clock radio is completely incorrect, and the day indicator is also wrong, press the MONTH/DATE button to see the date. If the date display is showing “1 1” (January 1 ), you probably experienced
a total memory loss. To reset the clock after a total memory loss, proceed as follows:

1.) Install a new CR2430 lithium battery in the battery compartment.

2.) Connect the radio to your AC outlet and let the clock set itself.

3.) Depress the MONTH/DATE and TIME buttons together. The display will change from ‘time’ to ‘year’. While holding the MONTH/DATE and TIME buttons, press the UP button to
set the display to the correct year, then release the buttons.

4.) Depress the MONTH/DATE button. The display will change from ‘time’ to 'month/date’ (mm/dd). While holding the MONTH/DATE button, press the UP button to set the display
to the correct month and date. The Day indicator will change automatically as you adjust the month/date settings. When the correct month and date appear on the display, release the buttons.

5.) Depress the TIME button and the UP button to set the display to the correct time. Be sure to confirm that you have set the time correctly to ‘AM’ or ‘PM’ by observing the AM indicator.

6.) After you set the time, reconfirm that the Day, and Month/Date displays are still correct. Make final adjustments if necessary.

The SmartSet clock memory is now reset and the new lithium battery will maintain it for the next 5 to 8 years, depending on the number and duration of the power outages you experience.

IMPORTANT NOTE:
After resetting the clock, don’t forget to reset your wake up times, and alarm mode settings, and sleep timer settings as well.