Google Spreadsheet SUMIF Date Comparison

Question

I'm trying to get this aggregate date comparison working, and I thought I understood the syntax, but it's clearly not working. Can anyone correct the formula for me?

I'm trying to sum up the amounts in column I, where the date in H is prior to the date in A

My formula is =SUMIF(H$2:H,H$2:H<A4, I$2:I)

Answer 1

Just a small error with your SUMIF syntax:

=SUMIF(H$2:H;"<"&A4;I$2:I)