Hey everyone!

Does anyone know how to limit the number of days in February to 29 instead of 31. I know this might be a silly question, but I am relatively new to HTML and I don't really know what to type in google to find the answer. I typed things like "HTML February day limit" and "HTML Date of Birth form February", but the results were irrelevant. Anyway, I have so far created a 3 box date input, similar to the facebook signup system.