diff --git a/src/NodaTimeSplitter.php b/src/NodaTimeSplitter.php
index f542d17..2daa12b 100644
--- a/src/NodaTimeSplitter.php
+++ b/src/NodaTimeSplitter.php
@@ -552,6 +552,10 @@ final class NodaTimeSplitter {
 
         $datum = self::clean_input($datum);
 
+        if (strlen($datum) === 21 && substr($datum, 10, 1) === '-' && substr($datum, 0, 10) === substr($datum, -10)) {
+            $datum = substr($datum, 0, 10);
+        }
+
         // 10000-20000
         if (!empty(\preg_match("/^[0-9]{5}(\-|\/)[0-9]{5}$/", $datum))) {
             return new NodaSplitTime(start_year: \substr($datum, 0, 5), end_year: \substr($datum, -5));
diff --git a/tests/NodaTimeSplitterTest.php b/tests/NodaTimeSplitterTest.php
index b67f883..8b6113e 100644
--- a/tests/NodaTimeSplitterTest.php
+++ b/tests/NodaTimeSplitterTest.php
@@ -71,6 +71,24 @@ final class NodaTimeSplitterTest extends TestCase {
                     end_date: '2020-01-02'),
                 "02.01.2020",
             ],
+            "2020-01-02-2020-01-02" => [
+                "2020-01-02-2020-01-02",
+                new NodaSplitTime('2020', '2020',
+                    counting_time_month: '01',
+                    counting_time_day: '02',
+                    start_date: '2020-01-02',
+                    end_date: '2020-01-02'),
+                "02.01.2020",
+            ],
+            "2020-01-02" => [
+                "2020-01-02",
+                new NodaSplitTime('2020', '2020',
+                    counting_time_month: '01',
+                    counting_time_day: '02',
+                    start_date: '2020-01-02',
+                    end_date: '2020-01-02'),
+                "02.01.2020",
+            ],
             "2.1.2020" => [
                 "2.1.2020",
                 new NodaSplitTime('2020', '2020',