Change in date of birth in birth certificate

Dear sir, my actual date of birth is 26/04/1993. I ve a birth certificate in this regard and also hospital discharge record should be there as I born in a govt hospital. As I got double promoted in a school and hence I made to SSC 2 years early. At the last moment, school principal had told that it was not possible to get permission from secondary school board. Only option was to get a 6 months or so permission from the local general hospital. I m not sure about any evidence in this regard. And based on this only my date of birth was changed to 26/09/1991. Based on the SSC certificate I got all other documents. Later, as statutory requirement, I was asked for date of birth certificate while applying for passport. So somehow I had managed to get the birth certificate in this new date I.e., 26/09/1991. And i got passport also with this date. Now I'm serving in central govt since 2016. I wish to change the date of birth of mine to 26/04/1993. Any change, if exists, should be made only within 5 years of joining as per rules in vogue. So I request your kind reply in this regard that if I can change my date of birth to original one i.e., 26/04/93 legally without facing any legal issues because I had birth certificate also in the other date i.e., 26/04/91. Any help is highly appreciated sir. Thank you