To write code or program prostate to the Internet site

the Problem in a nutshell is the following-
On the website the user enters 2 dates of birth( and your partner, husband, wife, etc.)
Introduces the names
Enters his email

What have to calculate the program( script, code, or any other tool, I don't know the terms sorry)!?

Version "light"
- Should calculate the sum of the numbers birthday
-Must calculate the amount of the birthday and month
-Should calculate the sum of all numbers of the birth

For example people born 15.11.2015
- The sum of day of birth = 6( 1 5)
-The sum of day of birth and month = 8 (1 5 1 1)
-The sum of all numbers of the birth = 7 (1 5 1 1 2 0 1 5= 16 ...1 6)

Later in the form on the website we code the answers according to the digital values 1 to 9
And entered e-mail user must come zaprogramirovan the answer.

For more "heavy" version I will communicate directly with the contractor! Thank you!