Change of Date of birth in passport

Hello Sir/Madam, My passport got expired 3 years back which was never used for any travel. My date of birth 22april1987 matches with passport which was issued before my 10th exam. But 10th certificate date of birth had mistake with 22july1987 which I mistakenly continued for all my educational certificate as well as DL,Voter ID ,Pan card, Adhar card , Marriage certificate & others as well. Last time when I went to passport office for reissuing my certificate with change of DOB 22july1987 , I told the passport officer that I have no idea which DOB proof I have submitted because my Dad expired soon after applying for my passport. I also told the Officer that I don't have Birth certificate. Then he scholded me badly & told me that it's an criminal offence to have 2 DOB. He then suggested me to get First Class Magistrate Issued certificate claiming that my 10th mark sheet DOB is original. But I got afraid then & did not proceed further. Now for my job opportunity I need to get the passport with current DOB which is 22july1987. But here the question is if in verification they find my Birth Certificate which I have submitted for applying passport 13 years back what situation may occur? I don't want to change my current DOB as all my documents having same DOB. Rather I want to change my Passport DOB. Because in any case I never used my Birth Certificate nor I will... Please suggest the procedure to change my DOB in Passport before applying. I don't want any trouble further. I am seriously worried about this matter. Please help me to come out of the situation. I am from Kolkata but I want to reissue it from Pune as I am currently residing here. Thanks & Regards, Mishu.