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<?php
/**
 * Gravity Wiz // Gravity Forms // Modify Date Field Format in Entries
 * http://gravitywiz.com/
 */
// Replace "123" with your form ID and "7" with your Date field ID.
add_filter( 'gform_get_input_value_123_7', function( $value ) {
	// See PHP date() documentation for more details on date formatting: http://php.net/manual/en/function.date.php
	$date_format = 'l, m/d/Y'; // i.e. Tuesday, 01/13/1987.
	return date( $date_format, strtotime( $value ) );
} );