Allow splitting "Jahr 1920"

src/NodaTimeSplitter.php

@@ -355,6 +355,10 @@ final class NodaTimeSplitter {
             }
         }
 
+        if (\preg_match("/^(Jahr|Jahre)\ [0-9]{4}$/", $datum)) {
+            $end = \substr($datum, -4);
+            return new NodaSplitTime($end, $end);
+        }
         if (\preg_match("/^[0-9]{4}\ bis\ [0-9]{4}$/", $datum)) {
             $start = \substr($datum, 0, 4);
             $end = \substr($datum, -4);

tests/NodaTimeSplitterTest.php

@@ -25,6 +25,20 @@ final class NodaTimeSplitterTest extends TestCase {
     public static function splittableGermanTimeNamesProvider():array {
 
         return [
+            "Jahr 1920" => [
+                "1920",
+                new NodaSplitTime('1920', '1920',
+                    start_date: '1920-01-01',
+                    end_date: '1920-12-31'),
+                "1920",
+            ],
+            "Jahre 1920" => [
+                "1920",
+                new NodaSplitTime('1920', '1920',
+                    start_date: '1920-01-01',
+                    end_date: '1920-12-31'),
+                "1920",
+            ],
             "1920er Jahre" => [
                 "1920er Jahre",
                 new NodaSplitTime('1920', '1929',