From de7968fbbd75605955e0b91365be374e9b88426c Mon Sep 17 00:00:00 2001
From: Joshua Ramon Enslin <joshua@museum-digital.de>
Date: Sun, 27 Sep 2020 12:38:38 +0200
Subject: [PATCH] Only allow splitting by international format if month < 13

---
 src/NodaTimeSplitter.php | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/NodaTimeSplitter.php b/src/NodaTimeSplitter.php
index 76c2f33..6077436 100644
--- a/src/NodaTimeSplitter.php
+++ b/src/NodaTimeSplitter.php
@@ -528,8 +528,13 @@ final class NodaTimeSplitter {
         if (preg_match("/^[0-9][0-9][0-9][0-9]\-[0-9][0-9]\-[0-9][0-9]$/", $datum)) { // German Y-m
             $start = substr($datum, 0, 4);
             $month = substr($datum, 5, 2);
-            $day   = substr($datum, 8, 2);
-            return [$start, $start, $month, $day, "+", ""];
+            if (intval($month) < 13) {
+                $day   = substr($datum, 8, 2);
+                return [$start, $start, $month, $day, "+", ""];
+            }
+            else {
+                unset($start, $month);
+            }
         }
         // German MM.JJJJ
         if (preg_match("/^[0-9][0-9]\.[0-9][0-9][0-9][0-9]$/", $datum)) { // German Y-m