I am trying to count blanks cells with conditions.

In column 'A' I have a list of dates and in column 'B' I have a list of group numbers (two digits, formatted as text - to preserve two digits under the value of 10). Some of the cells in column 'B' are blank (no group number assigned).

I need to count the blank cells that occur between a specific date range.

I have tried countif, sumproduct, and nested if functions but I am just not getting it right. I am either getting a value of 0, false or just a plain error.

Any help would be greatly appreciated.