A GA PVT DEP A CLOSED PART TIME ATCT ARPT WITHIN THE ENHANCED CLASS B AIRSPACE WITHOUT APPROVAL FROM ATC NEAR ZZZ; US.

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I DEPARTED ZZZ ON 11/SAT/01 AT APPROX XA00 IN A GA ACFT XXXX FOR A LOCAL VFR FLT. PRIOR TO DEP; I CHECKED WITH THE LOCAL FLT SCHOOL FOR NORMAL OPS IN THE ARPT VICINITY. AFTER DEPARTURE; I DETERMINED TO FLY TO ZZZ2. IN FLT I CONTACTED ATC TO REQUEST VFR RADAR ADVISORIES. ATC ISSUED A TRANSPONDER CODE FOR THE FLT TO ZZZ2 AND REQUESTED THAT I ADVISE ANY CHANGES IN ALTITUDE. WE PROCEEDED ON COURSE TO ZZZ2 AND AFTER SEVERAL HANDOFFS FROM ATC ALONG THE ROUTE AND APPROX 10 MILES FROM ZZZ2 THE ATC CONTROLLER INFORMED ME THAT I WAS CLRED INTO THE CLASS B AIRSPACE AT OR BELOW 2500 FT. I ACKNOWLEDGED. SEVERAL MOMENTS LATER; THE CTLR TOLD ME TO CONTACT THE TWR. I CONTACTED THE TWR AND WAS REQUESTED TO RPT A THREE-MILE FINAL FOR RWY. I LANDED AND PROCEEDED TO THE FBO FOR PARKING. AFTER SECURING THE ACFT AT THE FBO; I MENTIONED TO THE LINE CREW AND FBO STAFF THAT WE WOULD BE DEPARTING LATER IN THE EVENING AND ASKED IF THERE WERE ANY SPECIAL DEPARTURE PROCS. I WAS INFORMED THAT THE TOWER WOULD CLOSE AND TO MONITOR THE ATIS FOR ANY INSTRUCTIONS. I RETURNED TO THE ARPT AT AROUND XA00. AFTER STARTING THE AIRPLANE I MONITORED THE ATIS FOR THE ARPT INSTRUCTIONS. THE ATIS PROVIDED LOCAL WX CONDITIONS AND INSTRUCTIONS AND FREQUENCIES AND PROCS FOR LIGHT ACTIVATION AND ATC FREQUENCIES. WE TAXIED TO THE ACTIVE RWY; DEPARTED THE ARPT. AFTER DEP; WE CONTACTED ATC AND REQUESTED ADVISORIES TO ZZZ. THE CTLR INFORMED ME THAT I SHOULD NOT HAVE DEPARTED ZZZ2 AFTER THE TWR WAS CLOSED AND PROVIDED ME WITH A TELEPHONE NUMBER TO CONTACT ATC UPON LNDG. I CONTACTED ATC AND WAS INFORMED THAT I HAD VIOLATED THE ZZZ3 ENHANCED CLASS BRAVO AIRSPACE.