title: how to make an input date field greater than or equal to another date field using validation in laravel
body: <p>Hi iam developing an application using laravel is there any way to make an input date field greater than or equal to another date field using validation. </p>
  
  <p>I know that i can achieve this through jquery and i have already got that working, but i want to know whether is this achievable through laravel validation since laravel has got some predefined validations.</p>
  
  <p>For Example</p>
  
  <pre><code>protected $validationRules = array
      (   
        'a' =&gt; 'date',
        'b' =&gt; 'date|(some validation so that the b value is greater than or equal to that of 'a')'
      );
  </code></pre>
  
  <p><strong>EDIT</strong></p>
  
  <p>If there is any other approach to solve the problem using laravel concept please tell me</p>
  
  <p><strong>I tried</strong></p>
  
  <pre><code>Validator::extend('val_date', function ($attribute,$value,$parameters) {
      return preg_match("between [start date] and DateAdd("d", 1, [end date])",$value);
  });
  </code></pre>
  
  <p>Thanks in advance </p>