Fixed unittest failure by updating --suffix testcase: archivemail used to expand

date directives in the suffix to the current date, but rev. 94 changed that to
the archive cut off date.  Based on analysis by Peter Poeml.  Thanks, Peter.

test_archivemail.py

@@ -706,7 +706,9 @@ class TestArchiveMboxSuffix(unittest.TestCase):
         """archiving with specified --suffix arguments"""
         for suffix in ("_static_", "_%B_%Y", "-%Y-%m-%d"):
             for execute in ("system_long", "system_short", "package"):
-                self.mbox_name = make_mbox(messages=3, hours_old=(24 * 181))
+                days_old_max = 180
+                self.mbox_name = make_mbox(messages=3, 
+                    hours_old=(24 * (days_old_max+1)))
                 self.copy_name = tempfile.mktemp()
                 shutil.copyfile(self.mbox_name, self.copy_name)
                 if execute == "system_long":
@@ -725,7 +727,11 @@ class TestArchiveMboxSuffix(unittest.TestCase):
                     sys.exit(1)
                 assert(os.path.exists(self.mbox_name))
                 self.assertEqual(os.path.getsize(self.mbox_name), 0)
-                parsed_suffix = time.strftime(suffix, time.localtime(time.time()))
+
+                parsed_suffix_time = time.time() - days_old_max*24*60*60
+                parsed_suffix = time.strftime(suffix, 
+                    time.localtime(parsed_suffix_time))
+
                 archive_name = self.mbox_name + parsed_suffix + ".gz"
                 assert(os.path.exists(archive_name))
                 self.assertEqual(os.system("gzip -d %s" % archive_name), 0)