Hi I've searched the internet for how to validate date inputs on a form that updates my records. There is plenty of information, but I am having trouble putting it all together. I have read a lot of posts about regular expressions, the preg_match() function and the date() function. I wrote the following function to validate the date, but it doesn't work when I key in a date with the wrong format.

PHP Code:
function check_date ($approval_date) {
preg_match('/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/'$approval_date)) {
'Please enter date in correct format.';

This is the code for the input:

PHP Code:
echo '<tr>

<td class="heading">Initial Registration Date: </td>


<span class="dates"><input type="text" name="approval_date" size="25" maxlength="25" value="' 
date("m/d/Y"check_date($approval_date)) . '" /></span>

<span id="date_format"> (mm/dd/yyyy)</span>


I placed the function directly above the code for the input.

As you can see from the input code, I am populating the input from the database and using the date function to put it in a mm/dd/yyyy format.

I want the user to be able update the date in the database with this form.

If someone has a chance to take a look, I would be grateful.