Think about how cron can be implemented. The basic function is timer, and this works like ye olde kitchen's egg-timer: at one point in time you wind it up, and then it'll ring 4 or 5 minutes later. Thus, for the next cron ring of the bell, the Cook will have to look at the clock and calculate the interval to the indicated point in time.
You'll have to let the Cook look at the clock some time before the next 1:00am, say, around midnight. The code goes something like this, with advance() overloaded with Date and long to advance the pseudo-clock:
date = df.parse( "2014-01-15T00:00:00.000-0000" ); // Note: midnight
advance( date );
kSession.fireAllRules(); // (Ah, ring in one hour!)
advance( 1000*60*60 );
kSession.fireAllRules(); // Ring!
advance( 24*1000*60*60 );
kSession.fireAllRules(); // Ring!
The postman only rings twice ;-)