Can I correct my date of birth?
The short answer is no, you cannot change your birth date. You were born when you were born, and this date is recorded on your birth certificate in order to prove your identity.
How do I prove my date of birth?
People generally possess a variety of official documents that attest to their age and/or date of birth. Most common among these is a driver's license or DL check. For nondrivers, a check of their government-issued identification card will do the trick.
Can you legally change your date of birth in India?
You can't — it's impossible anywhere in the world, not just in India — unless the birth year is an error. The birth certificate is a public record by the authorities recording the details of your birth — it cannot be changed unless the details are in error.