diff --git a/frigate/test/test_tz.py b/frigate/test/test_tz.py
new file mode 100644
index 0000000000..5be8010dda
--- /dev/null
+++ b/frigate/test/test_tz.py
@@ -0,0 +1,19 @@
+import unittest
+
+from frigate.util.time import get_normalized_tz_name
+
+
+class TestGetNormalizedTzName(unittest.TestCase):
+    def test_valid(self):
+        cases = [
+            ("utc", "UTC"),
+            ("america/new_york", "America/New_York"),
+        ]
+
+        for tz_name, expected in cases:
+            with self.subTest(tz_name=tz_name):
+                self.assertEqual(get_normalized_tz_name(tz_name), expected)
+
+    def test_invalid(self):
+        with self.assertRaisesRegex(ValueError, r"Unknown timezone: foo/bar"):
+            get_normalized_tz_name("foo/bar")