<?php

$start = $data->field_field_ce_date[0]['raw']['value'];
$end = $data->field_field_ce_date[0]['raw']['value2'];

$start_month = gmdate("F", $start);
$end_month = gmdate("F", $end);

$start_day = gmdate("J", $start);
$end_day = gmdate("J", $end);

if ($start_month == $end_month && $start_day == $end_day) {
  echo gmdate("F jS", $start);
} elseif ($start_month == $end_month && $start_day != $end_day) {
  echo gmdate("F jS", $start);
  echo " to ";
  echo gmdate("jS", $end);
} elseif ($start_month != $end_month) {
  echo gmdate("F jS", $start);
  echo " to ";
  echo gmdate("F jS", $end);
}

?>