Your kneecap (patella) sits over the front of your knee joint. As you bend or straighten your knee, the underside of the patella glides over the bones that make up the knee. Strong tendons help attach the kneecap to the bones and muscles that surround the knee.
NETWORKDAYS.INTL(D3,E3,0000000) calculates whole days between the two dates (no weekends, no holidays). NETWORKDAYS(D3,E3,0000000,$A$16:$A$24) calculates whole working days days between the two dates (Sat/Sun weekends, holidays as per your list in $A$16:$A$24). Difference in non-working days between the two dates.
Except the NETWORKDAYS function, there is another formula could help you to get how many workdays between two dates. In a blank cell, enter this formula =SUM(INT((WEEKDAY(A2-{2,3,4,5,6})+B2-A2)/7)), and then tap Enter key, and all the workdays will be calculated.