A CRJ200 TERMINATED AT NIGHT IN A NON MAINT STATION WITH A SVC CHK DUE. MAINT ADVISED CAPT TO CHANGE THE DATE TO THE NEXT DAY.

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UPON ARRING AND CLOSING OUT THE AFML FOR THE NIGHT; I NOTICED THAT THE ACFT WAS DUE A SVC CHECK THAT NIGHT. I CALLED MAINT CTL AND ADVISED THEM OF THIS. THE MAINT PERSON I REACHED TOLD ME; 'THAT'S EASY; I CAN TAKE CARE OF THAT;' AND TOLD ME TO CHANGE THE SVC DUE DATE TO THE NEXT DAY. HE DID THIS BASED UPON THE ASPECT THAT THE PRIOR DUE DATE FOR A SVC CHK WAS 9/WED/06; WHICH WOULD HAVE MADE THE DATE DUE ON 9/SAT/06. HOWEVER; THE ACTUAL SIGN OFF FOR THIS ACFT'S PRIOR SVC CHK HAPPENED TO BE 9/THURS/06; WHICH WOULD IMPLY THAT THE CURRENT SVC CHK WAS INDEED DUE ON 9/SUN/06. I AM NOT A MAINT PERSON AND DO NOT KNOW ALL OF THE REGULATIONS FOR MAINT REQUIREMENTS. STILL; I QUESTION THIS PRACTICE AS IT WOULD SEEM THAT IF IT WAS DONE THIS WAY CONSISTENTLY; THE ACR WOULD ACTUALLY BE ABLE TO GAIN DAYS AND PERFORM FEWER MAINT SVC CHKS EVERY YEAR. THE PHONE CONVERSATION WITH THIS MAINT PERSON SHOULD BE CLEARLY RECORDED. I WAS THE CAPT OF RECORD FOR THE DEPARTING FLT IN THIS ACFT THE NEXT DAY AND FELT UNCOMFORTABLE WITH THIS DISCREPANCY AND ALTERED DATE FOR A REQUIRED MAINT SVC CHK; AS AUTHORIZED BY MAINT CTL; AT XA:30 ON 9/SAT/06; ON THE GND AFTER THE LAST FLT OF THE DAY.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CAPT BELIEVES CHANGING THESE CHK TIMES IS PUTTING THE FLT CREW LICENSES AT RISK. THE SVC CHK TIMES ARE EVERY THREE DAYS AND WORKING THE CHK ON ONE DAY AND SIGNING FOR THE CHK ACCOMPLISHMENT ON THE NEXT DAY GIVES ONE MORE DAY OVER THE LIMIT. THE RPTR STATED IT'S A GAME MAINT IS PLAYING TO EXTEND SVC CHK TIMES AND FEELS HAVING THE FLT CREWS CHANGING THE CHK DUE DATE IN A NON MAINT STATION IS UNETHICAL AND MOST LIKELY ILLEGAL.