Payroll - Combine SUMPRODUCT, SUMIF, COUNTIF within date range

The attached spreadsheet has a "master" workesheet in which I enter customer info, salesperson info, and date. The totals spreadsheet automatically calculates number of sales, contact value.

I need to modify the following formulas to only calculate the data within a date range shown in 2 cells.

=COUNTIF(Master!A1:A176,PayPeriod!A4)
=SUMPRODUCT(--(Master!A1:A176=Totals!A4),(Master!K1:K176))
=E4SUMPRODUCT(--(Master!A1:A176=Totals!A4),(Master!K1:K176))

Attached is what I am talking about. The columns I need help with are yellow.

I could find anything like this by searching.

THANK YOU!