My parents don't know my date of birth. Is there any way to solve it?

If you were born in a hospital, the hospital usually has your birth certificate. The time on it is the most accurate. The date of birth is calculated according to the time of birth, and the time of birth is not known. We need to find someone who can calculate.

Like me, I don't know my own birthday, but some of my colleagues know each other in their families, so I can work it out.

Really not, if you know your date of birth and other detailed time, you can ask questions online and let someone who can calculate help you answer them.