I have these two text fields representing dates. The first one is today's date and the second one is the user's birth date. They must input data in yyyymmdd format but I do not have any special script for my form to understand that data as dates. It's just a string of numbers.
Now what I need is to calculate the age of the user by substracting these two dates.
Based on that result, I want either one of two checkboxes to get checked if the user is minor.