1 files changed, 23 insertions, 0 deletions
diff --git a/misc/tools/common.py b/misc/tools/common.py
index c38ef817b..d53c8e755 100644
--- a/misc/tools/common.py
+++ b/misc/tools/common.py
@@ -3,6 +3,7 @@ from __future__ import print_function
 import sys, os
 from os.path import dirname, abspath, join as pjoin
 import subprocess
+import time
 
 # patch PYTHONPATH to include $BASEDIR/build/venv/python/site-packages
 BASEDIR = abspath(pjoin(dirname(__file__), os.pardir, os.pardir))
@@ -34,5 +35,27 @@ def getVersion():
   return _version
 
 
+_local_tz_offs = None
+def getLocalTimeZoneOffset():  # in seconds from UTC
+  # seriously ugly hack to get timezone offset in Python
+  global _local_tz_offs
+  if _local_tz_offs is None:
+    tzname = time.strftime("%Z", time.localtime())
+    s = time.strftime('%z', time.strptime(tzname, '%Z'))
+    i = 0
+    neg = False
+    if s[0] == '-':
+      neg = True
+      i = 1
+    elif s[0] == '+':
+      i = 1
+    h = int(s[i:i+2])
+    m = int(s[i+2:])
+    _local_tz_offs = ((h * 60) + m) * 60
+    if neg:
+      _local_tz_offs = -_local_tz_offs
+  return _local_tz_offs
+
+
 # update environment to include $VENVDIR/bin
 os.environ['PATH'] = os.path.join(VENVDIR, 'bin') + ':' + os.environ['PATH']