Atomic clock is 2 hoursfast

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.

at a guess the time zone setting could be set incorrectly

Radio controlled atomic clock self sets, and self adjusts automatically. This clock is very easy to use!,Daylights Saving Time on/off option; 4 Time Zones - Pacific, Mountain, Central, or Eastern,Folds into smaller size for easy storage and travel; travel pouch included,Automatically sets day, date and time; 2 separate alarms - great for weekends,Sturdy, contemporary construction. Stand folds for easy storage. 2x AAA batteries included; as shipped to U.S. Government and institutions

Clock shouldn't lose time if it is receiving time signal. Do you have the signal indicator showing?
If not suggest you take the batteries out and reset the clock, making sure that you do not set a time.

Underneath make sure the switch is set to your time zone. Also check the day light savings setting.

http://www.lacrossetechnology.com/2171/manual.pdf

Simple to fix

This is more of a Clarification than a solution.
I've determined that the SS-5000 is not recognizing the changes to DST that happened in 2007.

From 1986 to 2006 this was the first Sunday in April to the last Sunday in October, but starting in 2007, it is observed from the second Sunday in March to the first Sunday in November, adding about a month to daylight saving time.

So in March the clock is still trying to keep the "earler" time and in November it's trying to keep the 'later' time.

I'm contacting HomeMedics Support to see if there's a resolution.

I have misplaced the manual for my sharp Atomic clock, need to reset the time zone and shut off the alarm. How can I obtain a new manual?

I had the same problem last year and called the number on the back of the clock 718-610-2717 - it was busy forever - finally I got through and they gave me another number to call - I did get the problem fixed I just can't remember how exactly to fix it again. I think I had to manually reset...I have been trying the original number again - but it has been busy for the 4 days I have been trying. I will keep trying...

so long as the US atomic clock adjusts their daylight saving times then you should be fine check this link for some more details (about the scr 110 but seems to be basically the same) http://www.amazon.com/H-H-Scott-SCR110-Atomic-Clock/dp/B00004TZDN/ref=sr_1_2/104-1966292-9407907?ie=UTF8&s=electronics&qid=1173502881&sr=1-2 hope this helps :)