From dc47c074d777c3d5568bf1e8c7e2145f3decd5a3 Mon Sep 17 00:00:00 2001
From: "Alexander A. Klimov" <alexander.klimov@netways.de>
Date: Tue, 5 Sep 2017 13:15:57 +0200
Subject: [PATCH] Handle absolute dates and times before
 1970-01-01T00:00:01+0000

refs #33
---
 application/forms/TimeRangePickerForm.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/application/forms/TimeRangePickerForm.php b/application/forms/TimeRangePickerForm.php
index 005a9fb..74a37d5 100644
--- a/application/forms/TimeRangePickerForm.php
+++ b/application/forms/TimeRangePickerForm.php
@@ -162,6 +162,10 @@ class TimeRangePickerForm extends Form
 
                 $this->getUrl()->remove("graph_$part");
             } else {
+                if ($dateTime->getTimestamp() < 1) {
+                    $dateTime = DateTime::createFromFormat('U', '1')->setTimezone($this->getTimeZone());
+                }
+
                 if ($addInterval !== null) {
                     $dateTime->add(new DateInterval($addInterval));
                 }