AN A319 DEPARTING ATL CHANGED FMGS DATABASES 1 DAY EARLY. THIS INSERTED AN INCORRECT DEP FIX AND CAUSED ATC TO RELEASE THE FLT ON RADAR VECTORS.

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WE WERE CLRED INTO POS AND HOLD ON RWY 26L IN ATL. CTLR ASKED FOR FIRST FIX AFTER DEP. FO STATED SNUFY FROM THE GEETK SID. CTLR SAID THIS WAS WRONG; CALL CLRNC DELIVERY TO VERIFY ROUTING. FO WENT TO SECOND COM TO CALL CLRNC DELIVERY. IN RETROSPECT; THIS WAS A BAD IDEA. WE ARE ON THE RWY IN POS; WERE GETTING RUSHED TO GET THINGS DONE; TFC IS BACKING UP BEHIND US. FO WAS HAVING SOME TROUBLE WITH THE CTLR ON CLRNC DELIVERY. I AM GETTING VERY NERVOUS ABOUT BEING ON THE RWY. I DECIDED TO CALL THE TWR AND TELL HIM WE WANT TO TAXI OFF THE RWY AND SORT THIS OUT. THE FO RETURNS AS I AM CALLING HIM TO HEAR ACR CLRED FOR TKOF; FLY HDG OF 285 DEGS AT MIDDLE MARKER EXPECT RADAR VECTORS TO VUZ. I WENT AHEAD AND DEPARTED JUST TO GET OUT OF HERE AND OFF THE RWY. AFTER DEP THE FO AND I WENT OVER THE EVENT TO SORT OUT THE PROB. AS IT TURNS OUT THE NAV DATABASE CYCLE WAS 8 HRS TOO EARLY DEC/YY WAS ACTIVE AND THIS IS THE DEC/XX. FO IS NOT SURE IF HE CHANGED OR IT WAS THAT WAY WHEN WE GOT IN THE AIRPLANE. IT DOESN'T MATTER WE BOTH MISSED CATCHING IT. WE ALSO UPDATED OUR COMMERCIAL CHARTS EARLIER AND THERE WAS A CHANGE FOR THE ATL GEETK 1 TO THE GEETK 2 SID; BUT THOSE CHARTS HAD AN EFFECTIVE DATA OF DEC/YY. SO NOW OUR CHARTS MATCH THE WRONG DATABASE IN THE FMGS. I HAVE ALWAYS THOUGHT THAT THE EFFECTIVE DATE ON COMMERCIAL CHARTS IS TOO SMALL OF A TYPE. AS IT TURNS OUT; THE GEETK 1 WAS THE CORRECT SID WITH COURSE INTXN AS THE FIRST FIX; NOT THE GEETK 2 WITH SNUFY AS THE FIRST FIX. BUT AS STATED EARLIER THAT THE POS AND HOLD AND CALL CLRNC DELIVERY JUST PUT US IN THE WRONG MODE. I UNEQUIVOCALLY BELIEVE THAT IF I WENT AHEAD WITH MY FIRST IMPULSE AND TAXIED OFF THE RWY. THE ERRORS WOULD HAVE BEEN FOUND. AS PROVEN THAT ONCE WE WERE AIRBORNE AND EVERYTHING IS NORMAL; I CAUGHT THE MISTAKE IN ABOUT 2 MINS.