count multiple criteria entries in a sheet

Thanks, it helped, but one more thing. At the end of formula I should put command to AVOID DUPLICATION.

What is a command to avoid duplication from column B??

Again thanks

The result on the sheet 2 should be for January 19 instead of 18, because there are 19 inputs, and 4 for January, which is not shown on sheet 2.

The main question is number of inputs in column J without duplication in particular month.

Thanks and regards