diff --git a/src/fellchensammlung/tools/misc.py b/src/fellchensammlung/tools/misc.py
index 5403dfe..c2b2eaa 100644
--- a/src/fellchensammlung/tools/misc.py
+++ b/src/fellchensammlung/tools/misc.py
@@ -17,10 +17,10 @@ def pluralize(number, letter="e"):
 
 
 def age_as_hr_string(age: datetime.timedelta) -> str:
-    days = age.days
-    weeks = age.days / 7
-    months = age.days / 30
-    years = age.days / 365
+    days = int(age.days)
+    weeks = int(age.days / 7)
+    months = int(age.days / 30)
+    years = int(age.days / 365)
     if years >= 1:
         months = months - 12 * years
         return f'{years:.0f} Jahr{pluralize(years)} und {months:.0f} Monat{pluralize(months)}'
@@ -52,9 +52,9 @@ def time_since_as_hr_string(age: datetime.timedelta) -> str:
     elif weeks >= 3:
         text = _("vor %(weeks)d Wochen") % {"weeks": weeks}
     elif days >= 1:
-        text = ngettext("vor einem Tag","vor %(count)d Tagen", days,) % {"count": days,}
+        text = ngettext("vor einem Tag", "vor %(count)d Tagen", days, ) % {"count": days, }
     elif hours >= 1:
-        text = ngettext("vor einer Stunde", "vor %(count)d Stunden", hours,) % {"count": hours,}
+        text = ngettext("vor einer Stunde", "vor %(count)d Stunden", hours, ) % {"count": hours, }
     elif minutes >= 1:
         text = ngettext("vor einer Minute", "vor %(count)d Minuten", minutes, ) % {"count": minutes, }
     else:
diff --git a/src/tests/test_misc.py b/src/tests/test_misc.py
new file mode 100644
index 0000000..e95fa61
--- /dev/null
+++ b/src/tests/test_misc.py
@@ -0,0 +1,15 @@
+import datetime
+
+from fellchensammlung.tools.misc import age_as_hr_string
+from django.test import TestCase
+
+
+class AgeTest(TestCase):
+
+    def test_age_as_hr_string(self):
+        self.assertEqual("7 Wochen", age_as_hr_string(datetime.timedelta(days=50)))
+        self.assertEqual("3 Monate", age_as_hr_string(datetime.timedelta(days=100)))
+        self.assertEqual("10 Monate", age_as_hr_string(datetime.timedelta(days=300)))
+        self.assertEqual("1 Jahr und 4 Monate", age_as_hr_string(datetime.timedelta(days=500)))
+        self.assertEqual("1 Jahr und 11 Monate", age_as_hr_string(datetime.timedelta(days=700)))
+        self.assertEqual("2 Jahre und 6 Monate", age_as_hr_string(datetime.timedelta(days=900)))
\ No newline at end of file