Better handling of empty dates, showing an empty field rather than the...

Better handling of empty dates, showing an empty field rather than the Gregorian equivalent of the Unix epoch.

eth-timeline.php

@@ -157,8 +157,11 @@ class ETH_Timeline {
 	 *
 	 */
 	public function meta_box_dates( $post ) {
-		$start = (int) get_post_meta( $post->ID, $this->meta_start, true );
-		$end = (int) get_post_meta( $post->ID, $this->meta_end, true );
+		$start = get_post_meta( $post->ID, $this->meta_start, true );
+		$start = is_numeric( $start ) ? (int) $start : '';
+
+		$end = get_post_meta( $post->ID, $this->meta_end, true );
+		$end = is_numeric( $end ) ? (int) $end : '';
 
 		?>
 		<p id="eth-timeline-startbox">
@@ -188,7 +191,7 @@ class ETH_Timeline {
 			foreach ( $dates as $key => $date ) {
 				// Timestamp comes from JS
 				if ( empty( $date ) )
-					$timestamp = 0;
+					$timestamp = false;
 				else
 					$timestamp = strtotime( $date );