add UTC tools

Author: borgle

common.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+# coding:utf-8
+
+import datetime
+
+class UTC(datetime.tzinfo):
+    """UTC"""
+    def __init__(self,offset = 0):
+        self._offset = offset
+
+    def utcoffset(self, dt):
+        return datetime.timedelta(hours=self._offset)
+
+    def tzname(self, dt):
+        return "UTC +%s" % self._offset
+
+    def dst(self, dt):
+        return datetime.timedelta(hours=self._offset)