diff --git a/tests/unit/test_time.py b/tests/unit/test_time.py
index 8bc5ac8e..1901a4dc 100644
--- a/tests/unit/test_time.py
+++ b/tests/unit/test_time.py
@@ -3,6 +3,8 @@
 
 import datetime
 
+import pytest
+
 from jrnl import time
 
 
@@ -20,3 +22,23 @@ def test_default_minute_is_added():
         default_minute=30,
         bracketed=False,
     ) == datetime.datetime(2020, 6, 20, 0, 30)
+
+
+@pytest.mark.parametrize(
+    "inputs",
+    [
+        [2000, 2, 29, True],
+        [2023, 1, 0, False],
+        [2023, 1, 1, True],
+        [2023, 4, 31, False],
+        [2023, 12, 31, True],
+        [2023, 12, 32, False],
+        [2023, 13, 1, False],
+        [2100, 2, 27, True],
+        [2100, 2, 28, True],
+        [2100, 2, 29, False],
+    ],
+)
+def test_is_valid_date(inputs):
+    year, month, day, expected_result = inputs
+    assert time.is_valid_date(year, month, day) == expected_result