Prevent ambigious splitting of [0-9]{4}-[0-9]{2}

src/NodaTimeSplitter.php

@@ -609,6 +609,12 @@ final class NodaTimeSplitter {
 
             // Assume the end is a month
             if (intval($month) < 12) {
+                // If the year is smaller than the second number, do not split, as either month
+                // or year may be meant
+                // Example: 1903-04
+                if (substr($datum, 2, 2) < 12) {
+                    return false;
+                }
                 return new NodaSplitTime($year, $year, $month);
             }
             else {

tests/NodaTimeSplitterTest.php

@@ -604,6 +604,7 @@ final class NodaTimeSplitterTest extends TestCase {
             "13.13.2022",
             "2022-13-13",
             "40.10.2022",
+            "1903-04",
             "1903/04",
             "2022-10-40",
             "6;November 1978",