Token Replace is not working and $field_name value not getting evaluated and notices coming.

Using PHP version 5.6.

For notices I have updated line no. 176 with isset condition.

          if (isset($variables['element']['#formatter']) && $variables['element']['#formatter'] == 'date_default') {

I was not getting the value of the date.
line no. 193

$date = format_date(strtotime($variables['element']['#object']->$field_name['und'][0]['value']), 'custom', 'm/d/Y g:ia');

When I updated the code.

$date = format_date(strtotime($variables['element']['#object']->{$field_name}['und'][0]['value']), 'custom', 'm/d/Y g:ia');

It worked perfectly.

Again, I placed token inside the formatter for date field but they were not getting replaced. When I updated the the line no. 215 it worked fine.

$class_value = token_replace($settings[$value]['tokenized'], array('node' => $variables['element']['#object']));