Computer system clock has to be reset each time computer is started. It is sometimes hours off the correct time.

Dozens of models to choose from. All questions on Fixya need 'make model (what it is)' as the first 3 words.

Here are some guesses. The 'control cover' is where you put the back-up battery.

To change the 12/24 hour time format, open the CONTROL COMPARTMENT COVER on the bottom of the clock and adjust the 12/24 TIME FORMAT switch to the desired format .

Self-Setting Clock - Brookstone

Instruction Manual - Brookstone

Brookstone https://manuals.brookstone.com > ... PDF 12/24 HOURS TIME DISPLAY SETTING 1. The "12h" or "24h" will start flashing in LCD2 (Default setting 12h).

• 
  

  of 6 Page 2 of 6 - Brookstone

  https://manuals.brookstone.com > ... PDF
  Features: x WWVB Radio Controlled Clock (Atomic Clock) x Time in 12/24 hour format x Manual time setting option x Time Zone setting: +/- 12 Hours from GMT.

People also ask
How do you convert a 24-hour clock to a 12-hour clock?"); display: inline-block; height: 24px; width: 24px;"> How do I change my alarm clock to 24-hour clock?"); display: inline-block; height: 24px; width: 24px;"> What is 12.30 pm in 24-hour time?"); display: inline-block; height: 24px; width: 24px;"> Feedback

Setting The 12/24 Time Format; Setting The Daylight Savings ...

ManualsLib https://www.manualslib.com > ... > User manual
Brookstone TIMESMART Self-Setting Clock Radio Manual Online: setting the 12/24 time format, Setting The Daylight Savings Time. The 12 Hour Format Is Set As ...

To change the time on a Sterling & Noble wall clock that does not have any dials on the back, you will need to follow these steps:

1. Locate the small, round hole on the back of the clock. This is the reset button.
2. Using a small object, such as a paperclip or a toothpick, press and hold the reset button for about 5 seconds. This will reset the clock and allow you to set the time.
3. Release the reset button, and the minute hand will begin to move around the clock face. Use the reset button to advance the minute hand to the correct time.
4. Once the minute hand is set to the correct time, the hour hand will begin to move around the clock face. Use the reset button to advance the hour hand to the correct time.
5. Once the hour hand is set to the correct time, the clock will begin to run normally.

I hope this helps! If you have any further questions, don't hesitate to ask.

To reset the clock on a JVC PC-110 boombox from 1994, follow these steps:

1. Press the Clock Set button, located on the top of the boombox, to enter clock setting mode.
2. Press and hold the Clock Set button until the hour digits on the display start flashing.
3. Use the Fast Forward and Rewind buttons to adjust the hour to the correct time.
4. Press the Clock Set button again to move to the minute digits. The minute digits will start flashing.
5. Use the Fast Forward and Rewind buttons to adjust the minute to the correct time.
6. Press the Clock Set button one final time to exit clock setting mode and save the new time.

Your JVC PC-110 boombox should now display the correct time.

To correct the time on your Sharp Atomic clock, you will need to reset the time zone. To do this, press and hold the "Time Zone" button for 3 seconds until the time zone flashes. Then, press the "Hour" and "Minute" buttons to adjust the time zone to the correct time zone. Once the time zone is set, press the "Time Zone" button again to save the settings. The clock should now be displaying the correct time.

It could take an horologist a while to sort out why it suddenly changed. It isn't unusual for a chiming clock to chime at the quarters and half-hour as well as chiming and striking the hour. A quality clock usually allows the manner of chiming/striking to be selected and sometimes even the volume can be altered.

If your clock used to chime and strike the hour and now doesn't and appears to have slipped by exactly 30 minutes clearly something is happening. In the old days such things were often the result of turning the hands backwards to reset the time - that type of clock should be reset only by turning the hands forward and pausing at each quarter, half and hour to allow the chiming of each to complete. Most folk simply stop their clocks and wait for time to catch up...

It is also reckoned such a clock should not be kept next to an exterior wall but rather in a place where the temperature and humidity is the most stable.

Possibly these instructions:

http://forums.watchnet.com/index.php?t=tree&goto=110449&rid=0

DIGITAL WATCH USER INSTRUCTIONS May 27, 2006 - 05:59 PM On 5/26/2006 I bought from Walmart a $6.43 watch, on the back of which is written "AH 1175, 52, Battery CR2025, China Module, FMD, Base Metal Bezel, Stainless Steel Back, 100ft Water Resistant". It has no control buttons on top (where buttons may be accidentally pushed), the display is larger and more visible, and the color is dark, so I bought it even though I prefer models that have a fabric/velcro wrist-strap.
Four buttons on this watch are labelled: Light, Mode, Reset, and St/Sp. The instructions which I found inside its container refer to the Light button as A, the Mode button as B, the Reset button as C, and the Start/Stop button as D, but otherwise do not pertain to the watch, so I determined the button's functions by trial and error, as follows:
--
TO SELECT THE DISPLAY MODE
Push the Mode Button in order to select one of the following four display modes in the following order: Normal Time, Stop Watch, Alarm Reset, Time Reset.
In the Normal Time Mode, the Day of Week, the Hour, Minute and Second are displayed (none flash). If the Alarm and Hourly Chime icons are not displayed, the Alarm and Hourly Chime are turned off.
--
TO DISPLAY DAY OF WEEK, HOUR, MINUTE, SECOND AND WHETHER THE ALARM AND HOURLY CHIMES ARE ON:
Push the Mode button until no icon is flashing. The Alarm and Hourly Chimes are off if no Alarm or Chime icon is displayed beside the Second display.
--
TO DISPLAY THE DAY, MONTH AND DAY OF WEEK AND WHETHER THE ALARM AND HOURLY CHIMES ARE ON:
In Normal Time Mode, push the Start/Stop button. The Alarm and Hourly Chimes are off if no Alarm or Chime icon is displayed.
--
TO DISPLAY THE ALARM TIME
In Normal Time Mode, push the Reset button. The P or A beside the Alarm Time indicates PM or AM time. The P or A below the Alarm Time indicates a 12 hour clock; an H indicates a 24 hour clock.
--
TO STOP/START THE ALARM AND HOURLY CHIMES
In Normal Time Mode, hold the Start/Stop button down and push the Reset button (the Date and Day of Week will be displayed) to turn the preset Alarm and Hourly Chimes on, or off (to save the battery). To test the alarm, hold the Reset button down. The alarm and chimes are off when the alarm and chimes icons are not displayed.
--
TO STOP THE HOURLY CHIME
In Normal Time Mode, hold down the Reset button (the Alarm Time will be displayed) and push the Mode button until the Day of Week display is no longer highlighted; otherwise the hourly chime drains the battery.
--
TO SET THE TIME
To Fast/Forward until the correct number is displayed, hold the Start/Stop button down.
To set the Month of the Year, select the Time Reset Mode and push the Reset button until the Month of the Year number flashes; push the Start/Stop button until the correct Month of the Year is displayed and push the Reset Button.
To set the Day of Month, select the Time Reset Mode and push the Reset button until the Day of Month number flashes; push the Start/Stop button until the correct Day of Month is displayed and push the Reset Button.
To set the Day of Week, select the Time Reset Mode and push the Reset button until the Day of Week display flashes; push the Start/Stop button to until the correct Day of Week is displayed and push the Reset Button.
To set the Hour, select the Time Reset Mode and push the Reset button until the Hour number flashes; push the Start/Stop button until the correct Hour is displayed and push the Reset Button. For a 24 hour clock, push the reset button until an H is displayed. For a 12 hour clock, push the reset button until an A or P is displayed.
To set the Second, select the Time Reset Mode and push the Reset button until the Second number flashes. The Second number resets to Zero everytime the Start/Stop button is pushed. If the Start/Stop button is pushed as soon as the Second hand on your computer and watch are the same, the watch will be accurate to one second (to set your computer time to the second, log on to the Internet, right click on your PC's time display, select ADJUST DATE/TIME, INTERNET TIME, UPDATE NOW). The setting of the Second number will not be affected by setting the Minute number afterwards.
After the Second number is set, set the Minute number by selecting the Time Reset Mode and pushing the Reset button until the Minute number flashes; push the Start/Stop button until the correct Minute is displayed and push the Reset Button.
--
TO SET THE ALARM TIME AND TURN ON THE ALARM
Choose the Alarm Reset Mode. The alarm is turned on everytime the Alarm time is reset.
To select the Hour, push the Start/Stop button while the Hour is flashing and until the correct Hour is displayed, then push the Reset button (the Alarm and Hourly Chime icons will appear).
To select the Minute, push the Start/Stop button while the Minute is flashing and until the correct Minute is displayed, then push the Reset button.
Push the Mode button after the correct Alarm Time has been selected. The Alarm and Hourly Chime icons will be displayed beside the Second numbers.
The P icon indicates PM. The A icon indicates AM. The H icon indicates a 24 hour clock.
--
TO USE THE STOP WATCH
Choose the Stop Watch Mode. Push the Start/Stop button to begin the lap time. To pause the Stop Watch push the Start/Stop button to stop it and push it again to continue. To reset the Stop Watch to zero, stop the lap time by pushing the Start/Stop button, then push the Reset button (otherwise the Stop Watch will continue counting after other Modes are selected).

To set the hour on your Axiom clock, just hold down the "Clock" button until the time starts to flash. Then push that same button as many times as necessary to advance the hours to the correct hour (am or pm also). The minutes will be automatically set by the GPS computer from the satellite connection.

do a virus scan
in add/remove uninstall any programs you no longer use
then do a disk defrag
then a scan disk

have you made any changes to system
please let me know if this has helped
don't forget to rate

Set the Clock
You must set the clock once so that the
system announces the correct day and time
with your messages. After this, if you
subscribe to Caller ID, the system will
automatically reset the clock each time new
call information is received.
Press Pto exit at any time while
setting the clock.
1 Press and hold Cuntil the Message
Window displays C, and the default day
is announced.
2 To change the day setting, press and
release ror auntil
the correct day is announced.
3 Press and release C. The current
hour setting is announced.
4 To change the hour setting, press and
release ror auntil
the correct hour is announced.
5 Press and release C. The current
minutes setting is announced.
6 To change the minutes setting, press and
release ror auntil
the correct minutes setting is announced.
7 Press and release C. The current
year is announced.
8 To change the year setting, press and
release ror auntil
the correct year is announced.
9 Press and release C. The new day,
time, and year are announced.
To check the clock, press and release