What is the actual Geminids’ peak?

I’m a beginner in this subject. I’ve always been interested in astronomy, but it’s only recently that I’ve started some observations. I saw the Perseids this summer and followed other star showers and other events.
I’ve seen that the peak was on the night of 13th to 14th December or on the night of 14th to 15th December.
Perhaps it is too early to ask, but in which of these hypotheses is the peak? Or is the peak during these two nights?
Thank you!