diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index f9da87b6f1f..85c5312053c 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -1907,6 +1907,8 @@ class FormatterTest(unittest.TestCase):
         self.assertFalse(f.usesTime())
         f = logging.Formatter('%(asctime)s')
         self.assertTrue(f.usesTime())
+        f = logging.Formatter('%(asctime)-15s')
+        self.assertTrue(f.usesTime())
         f = logging.Formatter('asctime')
         self.assertFalse(f.usesTime())
 
@@ -1920,6 +1922,10 @@ class FormatterTest(unittest.TestCase):
         self.assertFalse(f.usesTime())
         f = logging.Formatter('{asctime}', style='{')
         self.assertTrue(f.usesTime())
+        f = logging.Formatter('{asctime!s:15}', style='{')
+        self.assertTrue(f.usesTime())
+        f = logging.Formatter('{asctime:15}', style='{')
+        self.assertTrue(f.usesTime())
         f = logging.Formatter('asctime', style='{')
         self.assertFalse(f.usesTime())
 
@@ -1935,6 +1941,8 @@ class FormatterTest(unittest.TestCase):
         self.assertFalse(f.usesTime())
         f = logging.Formatter('${asctime}', style='$')
         self.assertTrue(f.usesTime())
+        f = logging.Formatter('${asctime', style='$')
+        self.assertFalse(f.usesTime())
         f = logging.Formatter('$asctime', style='$')
         self.assertTrue(f.usesTime())
         f = logging.Formatter('asctime', style='$')