This festival occurs on the eight day (Astami) of a lunar fortnight hence the name (Krishna+astami). Krishnastami which comes sometime in August is celebrated over two days. The first day is Krishnastami or Gokulastami. The second day is called Kalastami or more popularly Janmastami.
I wish you 'Happy Janmashtmi' and pray to God for your prosperous life. May you find all the delights of life. May your all dreams come true. My best wishes will always be with you.