diff --git a/duration_utils.py b/duration_utils.py
index ee515c6..84c400f 100644
--- a/duration_utils.py
+++ b/duration_utils.py
@@ -10,6 +10,7 @@
     "h": 3600,
     "m": 60,
     "s": 1,
+    "d": 86400,
 }
 
 _TOKEN = re.compile(r"(\d+)([wdhms])")
diff --git a/tests/test_duration_utils.py b/tests/test_duration_utils.py
index b259480..029c44e 100644
--- a/tests/test_duration_utils.py
+++ b/tests/test_duration_utils.py
@@ -14,6 +14,12 @@ def test_seconds(self):
         self.assertEqual(parse_duration("45s"), 45)
 
     def test_weeks(self):
+
+    def test_days(self):
+        self.assertEqual(parse_duration("1d"), 86400)
+
+    def test_days_combined(self):
+        self.assertEqual(parse_duration("2d4h"), 187200)
         self.assertEqual(parse_duration("1w"), 604800)
 
     def test_combined(self):