SUM Value Between Dates

So I have the following Table

Columns
A | B | C | D
Line # | From Date | To Date | Days Worked

I want to create a formula to the side that allows me to sum the days worked between any 2 dates. I've been trying it with this with no luck. K8 is the start date I want to use for my query and L8 is the end date. This formula is to show total days worked.

=SUMIFS(D:D,C:C,">=K8",D:D,"<=L8")