#1155362: allow hh:mm:ss-uuuu like we allow hh:mm:ss+uuuu in parsedate_tz

Original patch by Thomas Herve.
diff --git a/Lib/email/_parseaddr.py b/Lib/email/_parseaddr.py
index 699d418..41694f9 100644
--- a/Lib/email/_parseaddr.py
+++ b/Lib/email/_parseaddr.py
@@ -64,8 +64,10 @@
     if len(data) == 4:
         s = data[3]
         i = s.find('+')
+        if i == -1:
+            i = s.find('-')
         if i > 0:
-            data[3:] = [s[:i], s[i+1:]]
+            data[3:] = [s[:i], s[i:]]
         else:
             data.append('') # Dummy tz
     if len(data) < 5:
diff --git a/Lib/email/test/test_email.py b/Lib/email/test/test_email.py
index a54c1a3..53c4042 100644
--- a/Lib/email/test/test_email.py
+++ b/Lib/email/test/test_email.py
@@ -2277,6 +2277,16 @@
         eq(utils.parsedate_tz('5 Feb 2003 13:47:26 -0800'),
            (2003, 2, 5, 13, 47, 26, 0, 1, -1, -28800))
 
+    def test_parsedate_no_space_before_positive_offset(self):
+        self.assertEqual(utils.parsedate_tz('Wed, 3 Apr 2002 14:58:26+0800'),
+           (2002, 4, 3, 14, 58, 26, 0, 1, -1, 28800))
+
+    def test_parsedate_no_space_before_negative_offset(self):
+        # Issue 1155362: we already handled '+' for this case.
+        self.assertEqual(utils.parsedate_tz('Wed, 3 Apr 2002 14:58:26-0800'),
+           (2002, 4, 3, 14, 58, 26, 0, 1, -1, -28800))
+
+
     def test_parsedate_acceptable_to_time_functions(self):
         eq = self.assertEqual
         timetup = utils.parsedate('5 Feb 2003 13:47:26 -0800')