Hello bahattinkor,

I had the same problem for 2 days using a DS1337. It displayed the default time and if I programmed a new starting time that would display but would continue from there. This was on a printed circuit board that was already working but had a little accident with a floating wire that went into the side of the power supply box and blew everything up! After replacing most of the parts the board worked for a few days then quit. I put new chips on the board again but to no gain. I put all of the same parts into a newer board and they worked fine. Went back to the old board and found no connection between one side of the crystal and the DS 1337.

The moral of this story is triple check your connections and use a meter!

BobK