Qurbani and Aqeeqah for adults

Assalamu alaikum,
Respected Mufti Sahab
My date of birth is 20/04/1982 this is according to Gregorian (Christian) calendar. What will be my date of birth according to Islamic calendar i.e. according to Hijri calendar (lunar). I have found out through the net and it showed 25/6/1402 Tuesday Jamadi Ussani. Is this calculation correct? Please tell me I want to know.
Jazzak Allah!