Index: Lib/imaplib.py
===================================================================
--- Lib/imaplib.py	(revision 88102)
+++ Lib/imaplib.py	(working copy)
@@ -22,7 +22,7 @@
 
 __version__ = "2.58"
 
-import binascii, errno, random, re, socket, subprocess, sys, time
+import binascii, errno, random, re, socket, subprocess, sys, time, calendar
 
 try:
     import ssl
@@ -1312,7 +1312,7 @@
         b'Jul': 7, b'Aug': 8, b'Sep': 9, b'Oct': 10, b'Nov': 11, b'Dec': 12}
 
 def Internaldate2tuple(resp):
-    """Convert IMAP4 INTERNALDATE to UT.
+    """Convert IMAP4 INTERNALDATE to local time.
 
     Returns Python time module tuple.
     """
@@ -1339,19 +1339,9 @@
         zone = -zone
 
     tt = (year, mon, day, hour, min, sec, -1, -1, -1)
+    utc = calendar.timegm(tt) - zone
 
-    utc = time.mktime(tt)
-
-    # Following is necessary because the time module has no 'mkgmtime'.
-    # 'mktime' assumes arg in local timezone, so adds timezone/altzone.
-
-    lt = time.localtime(utc)
-    if time.daylight and lt[-1]:
-        zone = zone + time.altzone
-    else:
-        zone = zone + time.timezone
-
-    return time.localtime(utc - zone)
+    return time.localtime(utc)
 
 
 
@@ -1381,7 +1371,7 @@
 
 def Time2Internaldate(date_time):
 
-    """Convert 'date_time' to IMAP4 INTERNALDATE representation.
+    """Convert 'date_time' (local time) to IMAP4 INTERNALDATE representation.
 
     Return string in form: '"DD-Mmm-YYYY HH:MM:SS +HHMM"'
     """
Index: Lib/test/test_imaplib.py
===================================================================
--- Lib/test/test_imaplib.py	(revision 88102)
+++ Lib/test/test_imaplib.py	(working copy)
@@ -24,7 +24,9 @@
 class TestImaplib(unittest.TestCase):
 
     def test_Internaldate2tuple(self):
+        # The following two should produce the same result (see issue 10941).
         self.assertEqual(imaplib.Internaldate2tuple(b'25 (INTERNALDATE "01-Apr-2000 19:02:23 -0700")')[0:6], (2000, 4, 1, 19, 2, 23))
+        self.assertEqual(imaplib.Internaldate2tuple(b'101 (INTERNALDATE "02-Apr-2000 02:02:23 +0000")')[0:6], (2000, 4, 1, 19, 2, 23))
 
     def test_that_Time2Internaldate_returns_a_result(self):
         # We can check only that it successfully produces a result,