diff --git a/brel/characteristics/period_characteristic.py b/brel/characteristics/period_characteristic.py
index 3280b069..55b290c5 100644
--- a/brel/characteristics/period_characteristic.py
+++ b/brel/characteristics/period_characteristic.py
@@ -105,7 +105,7 @@ def __str__(self) -> str:
         if self.__is_instant:
             return f"{self.__instant_date}"
         else:
-            return f"{self.__start_date} - {self.__end_date}"
+            return f"{self.__start_date}/{self.__end_date}"
 
     def __eq__(self, __value: object) -> bool:
         if not isinstance(__value, PeriodCharacteristic):
diff --git a/tests/core_tests/test_fact.py b/tests/core_tests/test_fact.py
index 43a05256..ab3ec256 100644
--- a/tests/core_tests/test_fact.py
+++ b/tests/core_tests/test_fact.py
@@ -39,8 +39,8 @@ def test_qname_getters():
 
     assert fact.get_unit() == None, "Expected None as fact unit is not defined"
     assert (
-        str(fact.get_period()) == "2022-09-25 - 2023-07-01"
-    ), "Expected '2022-09-25 - 2023-07-01' as fact unit is 'from 2022-09-25 to 2023-07-01'"
+        str(fact.get_period()) == "2022-09-25/2023-07-01"
+    ), "Expected '2022-09-25/2023-07-01' as fact unit is 'from 2022-09-25 to 2023-07-01'"
     assert (
         str(fact.get_concept()) == "dei:DocumentQuarterlyReport"
     ), "Expected 'dei:DocumentQuarterlyReport' as fact concept is 'dei:DocumentQuarterlyReport'"