How to validate a date format using PHP

To check whether the date entered is in the correct format

NOTE: We will use the following date format within this example YYYY-MM-DD

Answer:

• Use the preg_match ‘Perform a regular expression match’  PHP function available for PHP 4 & 5 
• Find the correct expression
• And use the following code to check for the date format

  if(preg_match('/[12]\d{3}-[01]\d-[0123]\d/',$date)){
      $msg = "Valid date";
  }else{
      $msg = "Invalid date";
  }