diff --git a/Lib/email/_parseaddr.py b/Lib/email/_parseaddr.py
index 109ff5f..5821ddf 100644
--- a/Lib/email/_parseaddr.py
+++ b/Lib/email/_parseaddr.py
@@ -124,7 +124,8 @@
         else:
             tzsign = 1
         tzoffset = tzsign * ( (tzoffset//100)*3600 + (tzoffset % 100)*60)
-    return yy, mm, dd, thh, tmm, tss, 0, 1, 0, tzoffset
+    # Daylight Saving Time flag is set to -1, since DST is unknown.
+    return yy, mm, dd, thh, tmm, tss, 0, 1, -1, tzoffset
 
 
 def parsedate(data):
diff --git a/Lib/email/test/test_email.py b/Lib/email/test/test_email.py
index d35e770..d977693 100644
--- a/Lib/email/test/test_email.py
+++ b/Lib/email/test/test_email.py
@@ -2113,12 +2113,12 @@
     def test_parsedate_no_dayofweek(self):
         eq = self.assertEqual
         eq(Utils.parsedate_tz('25 Feb 2003 13:47:26 -0800'),
-           (2003, 2, 25, 13, 47, 26, 0, 1, 0, -28800))
+           (2003, 2, 25, 13, 47, 26, 0, 1, -1, -28800))
 
     def test_parsedate_compact_no_dayofweek(self):
         eq = self.assertEqual
         eq(Utils.parsedate_tz('5 Feb 2003 13:47:26 -0800'),
-           (2003, 2, 5, 13, 47, 26, 0, 1, 0, -28800))
+           (2003, 2, 5, 13, 47, 26, 0, 1, -1, -28800))
 
     def test_parsedate_acceptable_to_time_functions(self):
         eq = self.assertEqual
diff --git a/Lib/email/test/test_email_renamed.py b/Lib/email/test/test_email_renamed.py
index ed186a0..4ac2ee9 100644
--- a/Lib/email/test/test_email_renamed.py
+++ b/Lib/email/test/test_email_renamed.py
@@ -2119,12 +2119,12 @@
     def test_parsedate_no_dayofweek(self):
         eq = self.assertEqual
         eq(utils.parsedate_tz('25 Feb 2003 13:47:26 -0800'),
-           (2003, 2, 25, 13, 47, 26, 0, 1, 0, -28800))
+           (2003, 2, 25, 13, 47, 26, 0, 1, -1, -28800))
 
     def test_parsedate_compact_no_dayofweek(self):
         eq = self.assertEqual
         eq(utils.parsedate_tz('5 Feb 2003 13:47:26 -0800'),
-           (2003, 2, 5, 13, 47, 26, 0, 1, 0, -28800))
+           (2003, 2, 5, 13, 47, 26, 0, 1, -1, -28800))
 
     def test_parsedate_acceptable_to_time_functions(self):
         eq = self.assertEqual