CORPORATE ACFT DEPARTS WITHOUT BEING CERTAIN OF CURFEW HRS.

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WE WERE SCHEDULED FOR AN XY00 LCL DEP OUT OF SAN AND WERE ADVISED OF THE ARPT'S XX00 LCL RESTRICTION FOR NON-STAGE III ACFT. DURING OUR PREFLT; WE WERE ADVISED BY THE LCL FBO REPRESENTATIVE OF AN XY00 LCL RESTRICTION. THIS WAS AT XX00 LCL AND DURING THE DISCUSSION ANOTHER REPRESENTATIVE OF THE FBO RECONFIRMED OUR PREVIOUS XZ00 LCL RESTRICTION. WE THEN CALLED OUR DISPATCHER TO CONFIRM THE RESTRICTION. WE WERE REASSURED THAT THE RESTRICTION WAS FOR XZ00 LCL. WE STARTED ENGS AND TAXIED THE ACFT AT XY20 LCL AND REQUESTED TKOF CLRNC AT XY30 LCL FOR AN XY35 LCL DEP. WE ARE STILL NOT SURE OF THE RESTRICTION OF XY OR XZ00 LCL AND I'M NOT SURE HOW TO CLR UP THE CONFUSION. WE ARE WORKING WITH DISPATCH TO SEE HOW THEY GET THEIR INFO AND XCHKING WITH THE PLTS WITH REFS TO CHARTS AND DOMESTIC NOTAMS. WITH THE NUMBER OF RESTR ARPTS GROWING DAILY WE HAVE TO HAVE A FAIL PROOF METHOD OF DETERMINING THESE RESTRICTIONS. SUPPLEMENTAL INFO FROM ACN 242127: CONFUSION EXISTED BTWN DISPATCH AND FLC AS TO CURFEW TIME. EXECUTIVE PAX UNAVOIDABLY DELAYED; AND SO WAS OUR DEP.