sumif: multiple critera including date

hello,

I’m trying to get the sum of a column, with specific criteria.

In cell 3B, in the "asbestos" sheet, I would like the sum of column H in the "incidents" sheet matching the criteria:

Incidents sheet:
Column A = asbestos
Column B = January

The code I’ve tried is:

((Incidents!$A$4:$A$500=$a$1)*(Incidents!$C$4:$C$500>=$A4)*(Incidents!$C$4:$C$500<=DATE(YEAR($A4),MONTH($A4)+1,1))

I’m sure there’s really simple solution to this...

Any help much appreciated!

many thanks

Rich