Populating vacation leave.

Hi!
I'm trying to create vacation tracker for our employees
but i can't get it correctly. All i want it will automatically
highlight the days of the month using the "start date and "end date".
kindly please help me to solve this problem of mine?

attached of this message is the sample that i made.

Thanks!

kind regards,
April

it really help.

Thanks a lot.

Kind regards,
April