I have A Problem I am Making A Program to Register Appointments

then I Want The Calendar When Selecting A Date Anyone to Show Me The Day Of The Week But In Numbers.

for example. Sunday 1, Monday 2, Tuesday 3, Wednesday 4, Thursday 5, Friday 6, Saturday 7.

when I Select A Date Then it Sends Me Anything But The Day Current Example Tuesday 3.

I want him to send me a future date
for example being today Tuesday wants to choose Friday and show the day but in I number.

I appreciate A Prompt Help...