[Findit] Add local git parsers.

appengine/findit/common/test/time_util_test.py

Index: appengine/findit/common/test/time_util_test.py
diff --git a/appengine/findit/common/test/time_util_test.py b/appengine/findit/common/test/time_util_test.py
index 105fae3c6337e93e776ea03753ce885fd4f89a0a..bbf007180e54fe0257c7ce8289f6baea5e190994 100644
--- a/appengine/findit/common/test/time_util_test.py
+++ b/appengine/findit/common/test/time_util_test.py
@@ -52,3 +52,17 @@ class DiffTest(unittest.TestCase):
     self.assertIsNone(time_util.FormatDuration(None, date1))
     self.assertIsNone(time_util.FormatDuration(date1, None))
     self.assertEqual('00:01:00', time_util.FormatDuration(date1, date2))
+
+  def testTimeZoneInfo(self):
+    naive_time = datetime(2016, 9, 1, 10, 0, 0)
+
+    tz = time_util.TimeZoneInfo('+0800')
+    self.assertEqual(tz.utcoffset, timedelta(minutes=480))

[stgao, 2016/10/22 00:39:16]

+chanli: is this correct? I remembered you worked on some similar code?

[Sharu Jiang, 2016/10/25 00:36:19]

I just found out I can use 'TZ=UTC git log --date=local' to let git do the
conversion, the timezone is no longer needed.

+    self.assertEqual(tz.LocalToUTC(naive_time), datetime(2016, 9, 1, 18, 0, 0))
+
+    tz_negative = time_util.TimeZoneInfo('-0700')
+    self.assertEqual(tz_negative.utcoffset, timedelta(minutes=-420))
+    self.assertEqual(tz_negative.LocalToUTC(naive_time),
+                     datetime(2016, 9, 1, 3, 0, 0))
+
+