[Predator] Move time_util from common/ to lib/, split code review related part to code_review_util

appengine/findit/lib/time_util.py

Index: appengine/findit/lib/time_util.py
diff --git a/appengine/findit/common/time_util.py b/appengine/findit/lib/time_util.py
similarity index 69%
rename from appengine/findit/common/time_util.py
rename to appengine/findit/lib/time_util.py
index 4ef6e8b8a41a167b34bb2a3d5fb090fadf27bf2a..243a3ec126f5c3d3c5b3def18424f1d11eb7ee32 100644
--- a/appengine/findit/common/time_util.py
+++ b/appengine/findit/lib/time_util.py
@@ -66,3 +66,33 @@ def GetDatetimeInTimezone(timezone_name, date_time):
     A datetime.datetime of the given one in the specified timezone.
   """
   return date_time.astimezone(pytz.timezone(timezone_name))
+
+
+class TimeZoneInfo(object):
+  """Gets time zone info from string like: +0800.
+
+  The string is HHMM offset relative to UTC timezone."""
+
+  def __init__(self, offset_str):
+    self._utcoffset = self.GetOffsetFromStr(offset_str)
+
+  def GetOffsetFromStr(self, offset_str):
+    offset = int(offset_str[-4:-2]) * 60 + int(offset_str[-2:])
+    if offset_str[0] == '-':
+      offset = -offset
+    return timedelta(minutes=offset)
+
+  def LocalToUTC(self, naive_time):
+    """Localizes naive datetime and converts it to utc naive datetime.
+
+    Args:
+      naive_time(datetime): naive time in local time zone, for example '+0800'.
+
+    Return:
+      A naive datetime object in utc time zone.
+      For example:
+      For TimeZoneInfo('+0800'), and naive local time is
+      datetime(2016, 9, 1, 10, 0, 0), the returned result should be
+      datetime(2016, 9, 1, 2, 0, 0) in utc time.
+    """
+    return naive_time - self._utcoffset