Is there a core method in views that can pad numbers with leading zeros?
Go to /sites/all/themes/yourtheme/ folder and in template.php add the following code:

function yourtheme_preprocess_views_view_fields($vars){

  if ($vars['view']-&gt;name == "view_name" &amp;&amp; $vars['view']-&gt;current_display == "block_1") {
    $vars['fields']['field_example']-&gt;content = str_pad($vars['fields']['field_example']-&gt;raw, 2, 0, STR_PAD_LEFT);
  }

}



replace yourtheme with the actual name of your theme
replace view_name with the name of your view.
replace block_1 with the machine name of your view. 
replace example with the name of your field (2 replacements). 


Lastly, in Drupal, clear/flush your cache to see the changes.