Camera resets DATE and Time to Jan 2002 when

Some of these cameras cannot save the date, and has no internal battery to save the data. The best solution I have use is to buy another battery with these kinds of cameras and always have one charging, or take two batteries when you take pictures.
These older point and shoot cameras are nice, and slower than the newer ones, but will not save the data unless you keep the main battery in it, or replace the one to be charged with another battery within a very short time.