diff --git a/TODO.txt b/TODO.txt
index a9a6e3a..6b7b399 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -1,5 +1,4 @@
 - FIX: validation for first_day
-- FIX: no timezone on pre_meeting
 
 - Test event list export
 
diff --git a/dav_events/converters.py b/dav_events/converters.py
index c4e3f85..3a09a34 100644
--- a/dav_events/converters.py
+++ b/dav_events/converters.py
@@ -1,5 +1,6 @@
 import datetime
 import logging
+import pytz
 import re
 from six import string_types
 
@@ -21,7 +22,7 @@ class Iso8601Serializer(object):
                      r':(?P<sec>[0-5][0-9])'
                      r'([,.]\d{1,10})?'
                      r')?'
-                     r'(?P<offset>[\-+](([01][0-9])|(2[0123]))(:[0-5][0-9])?)?$')
+                     r'(?P<offset>(?P<offdir>[\-+])(?P<offhours>([01][0-9])|(2[0123]))(:(?P<offmins>[0-5][0-9]))?)?$')
 
     def __init__(self, instance=None, text=None):
         if instance is not None:
@@ -66,6 +67,17 @@ class Iso8601Serializer(object):
                 else:
                     value = datetime.datetime(int(gd['year']), int(gd['mon']), int(gd['day']),
                                               hour=int(gd['hour']), minute=int(gd['min']), second=int(gd['sec']))
+                    if gd['offset'] is not None:
+                        offset = datetime.timedelta(hours=int(gd['offhours']))
+                        if gd['offmins'] is not None:
+                            offset += datetime.timedelta(minutes=int(gd['offmins']))
+                        if gd['offdir'] == '+':
+                            value -= offset
+                        elif gd['offdir'] == '-':
+                            value += offset
+                        else:
+                            raise ValueError('Offset format not recognized \'{str}\''.format(str=gd['offset']))
+                        value = value.replace(tzinfo=pytz.UTC)
             elif not ignore_unsupported_input:
                 raise ValueError('Format not recognized \'{str}\''.format(str=haystack))
         elif not ignore_unsupported_input:
diff --git a/setup.py b/setup.py
index f397e0e..ef3055c 100644
--- a/setup.py
+++ b/setup.py
@@ -121,6 +121,7 @@ setup(
         'django-bootstrap3',
         'django-countries',
         'django-datetime-widget',
+        'pytz',
         'selenium',
         'coverage',
     ],