diff --git a/php/downloadPlot.php b/php/downloadPlot.php
index 7921f5b..df07905 100644
--- a/php/downloadPlot.php
+++ b/php/downloadPlot.php
@@ -62,7 +62,12 @@ function download_plot($sessionId, $interactiveId, $preview, $preview_function)
 		header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
 		header("Cache-Control: private",false); // required for certain browsers
 		header("Content-Type: $ctype");
-		header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" );
+		$newName ;
+		preg_match('/(\d+)/', basename($fullPath), $matches);
+		if (isset($matches[0])) {
+			$newName = str_replace('.png', '_'.date('YmdHis').'.png', str_replace($matches[0], (string)$matches[0]+1, basename($fullPath)));
+		}
+		header("Content-Disposition: attachment; filename=\"".$newName."\";" );
 		header("Content-Transfer-Encoding: binary");
 		header("Content-Length: ".$fsize);
 		ob_clean();
--
libgit2 0.21.2