Date and time strange problem

Hello. In my custom system based on Synergy S7 I have seen that the date time works well for the months from January to November, but when the date goes from 30 November to 1 December the seconds are not incremented anymore, so the date will remain always blocked on that day. 

Another part of this problem is that if I try to set any date with December as month, for an istant it is accepted, than automatically it goes back to the date that existed before of the attempt of modification. 

I am stuck on this...