--- ./include/defines.inc.php.orig	2017-04-19 21:19:23.000000000 +0200
+++ ./include/defines.inc.php	2017-04-19 23:12:36.000000000 +0200
@@ -32,6 +32,7 @@
 
 define('ZBX_MIN_PERIOD',		60); // 1 minute
 define('ZBX_MAX_PERIOD',		63072000); // the maximum period for the time bar control, ~2 years (2 * 365 * 86400)
+define('ZBX_MAX_BACK',			126144000); // ~4 years (4 * 365 * 86400)
 define('ZBX_MAX_DATE',			2147483647); // 19 Jan 2038 05:14:07
 define('ZBX_PERIOD_DEFAULT',	3600); // 1 hour
 
--- ./httpdetails.php.orig	2016-12-21 09:09:01.000000000 +0100
+++ ./httpdetails.php	2017-04-19 23:09:28.000000000 +0200
@@ -122,7 +122,7 @@
 $itemids = $httptest_manager->getHttpStepItems($httptest['httptestid']);
 $itemids = zbx_objectValues($itemids, 'itemid');
 
-$graph_in->timeline['starttime'] = date(TIMESTAMP_FORMAT, get_min_itemclock_by_itemid($itemids));
+$graph_in->timeline['starttime'] = date(TIMESTAMP_FORMAT, time() - ZBX_MAX_BACK);
 
 $url = (new CUrl('chart3.php'))
 	->setArgument('height', 150)
--- ./include/classes/screens/CScreenGraph.php.orig	2017-04-19 21:47:38.000000000 +0200
+++ ./include/classes/screens/CScreenGraph.php	2017-04-19 23:09:51.000000000 +0200
@@ -136,7 +136,7 @@
 				$isDefault = true;
 			}
 
-			$this->timeline['starttime'] = date(TIMESTAMP_FORMAT, get_min_itemclock_by_graphid($resourceId));
+			$this->timeline['starttime'] = date(TIMESTAMP_FORMAT, time() - ZBX_MAX_BACK);
 
 			$timeControlData['src'] = $this->screenitem['url'].'&width='.$this->screenitem['width']
 				.'&height='.$this->screenitem['height'].'&legend='.$legend
--- ./include/classes/screens/CScreenChart.php.orig	2017-04-19 21:47:51.000000000 +0200
+++ ./include/classes/screens/CScreenChart.php	2017-04-19 23:08:48.000000000 +0200
@@ -62,7 +62,7 @@
 		}
 		$src .= '?graphid='.$this->graphid.'&period='.$this->timeline['period'].'&stime='.$this->timeline['stimeNow'].$this->getProfileUrlParams();
 
-		$this->timeline['starttime'] = date(TIMESTAMP_FORMAT, get_min_itemclock_by_graphid($this->graphid));
+		$this->timeline['starttime'] = date(TIMESTAMP_FORMAT, time() - ZBX_MAX_BACK);
 
 		$timeControlData = [
 			'id' => $this->getDataId(),