From 6a91e31f41791ec37e1a1b419dd994518efb667b Mon Sep 17 00:00:00 2001
From: Joshua Ramon Enslin <joshua@museum-digital.de>
Date: Thu, 13 May 2021 23:00:23 +0200
Subject: [PATCH] Improve handling of timespans

---
 src/NodaTimeSplitter.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/NodaTimeSplitter.php b/src/NodaTimeSplitter.php
index 72d52ac..f5b1ee1 100644
--- a/src/NodaTimeSplitter.php
+++ b/src/NodaTimeSplitter.php
@@ -1030,8 +1030,9 @@ final class NodaTimeSplitter {
 
         $middle_substraction = round($days_diff / 2);
 
-        $middle_day = date('Y-m-d',
-            strtotime('+' . $middle_substraction . ' days', strtotime($startDate->format('Y-m-d'))));
+        if (!($startDateTimestamp = strtotime($startDate->format('Y-m-d')))) return [];
+        if (!($middleDayTimestamp = strtotime('+' . $middle_substraction . ' days', $startDateTimestamp))) return [];
+        $middle_day = date('Y-m-d', $middleDayTimestamp);
 
         $start_name = self::timePartsToTimeName($start);
         $end_name = self::timePartsToTimeName($end);