Question

We have an entry form that gives the user a calendar drop down, but also are allowed to type in a data manually. We discovered that if a person enters a 2-digit year, the year is changed to 1912 not 2012 (dates cannot be in the past). Is there a way I can:

1. Check if they entered a 2-digit year and convert that to a 4-digit year, or
2. Give them an error if they enter a 2-digit year.

This is on an HTML form and I also am using jQuery for a bunch of other stuff.

I should clarify that they enter the date as a whole date 01/01/2012 or 1/1/2012 is valid. 1/1/12 and 01/01/12 is not.

Answer 1

Simplest is a regexp as it will also invalidate non-numeric values;

​var s = $("#something").val();

if (!/^\d{4}​​​​​​​​​​​​​​​​​​​​​​​$/.test(s)) {
   alert ("Thats not a 4 digit number")​​​​​​​​​​​
   return;