I don't know if anyone else has any better answer to this, but it honestly seems like c-cex have messed up the time configuration on their API.
Looking at their API documentation, it seems they use a new time format for every API call, which is not good at all.
As for a fix for this, if you know their API is offset by X days you could just subtract that from the timestamp c-cex returns. It's really not an optimal solution, but their API seems really bad.
Yeah...I have also thought of that, but honestly it's a temporary workaround not a real solution. But thanks for your input anyway. I wrote C-CEX support about the problem. The issue still persist even after new trades have been made. In short the timestamp is not updated.