Checkout page needs to be modified

[login to view URL] is delivering only to 96815 zipcode in usa in checkout on step 4 i made a calendar that shows up to pick a date but it need some restrictions( like today or date before today cannot be picked) once the date is picked i would prefer a sellection of times to pop up for user to select it can be 9-10am 10-11 ... up to 6-7pm once this data is selected it needs to show up on the next step(checkout) and on invoices thank you