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This is a design glitch with these Nikons and many people are complaining about it. The clock battery is supposed to take a small charge from the main battery - enough to maintain the settings when the camera is not in use. However the clock battery that is used is not sufficiently strong enough to hold a charge for an adequate length of time.
As this is somewhat of a design flaw it is unlikely that a new clock battery will make any significant difference to the problem you are experiencing. Neither is it a user serviceable job and for these reasons I do not recommend that you try to replace the clock battery.
Nikon themselves say the following;
"The clock-calendar is powered by a separate rechargeable battery, which is charged as necessary when the main battery is installed. If the camera has been stored with the main battery removed for a long period of time, the clock may need to be reset.
Once the main battery has been reinserted, the clock battery will recharge in several hours, during which time the main battery should be left in the camera."
I have the same problem. The only way I can figure out how to reset the clock is to take out the batteries and put them back in at 11:59 pm or midnight. Replacing batteries reset the clock to 12:00 am. So if you do it at midnight, you'll end up with the right time. But for the life of me, I cannot figure out how to actually set the clock using the availble buttons.