diff --git a/bot.py b/bot.py
index bf95380..e04420e 100644
--- a/bot.py
+++ b/bot.py
@@ -16,8 +16,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from datetime import datetime
-from datetime import timedelta
+from datetime import datetime, timedelta, timezone
 import logging
 from queue import Queue
 import re
@@ -277,8 +276,8 @@ class Bot(threading.Thread):
         if len(self.events) > 0:
             logger.debug("Update timer: next event in %d seconds",
                          self.events[0].time_left.seconds)
-            if datetime.now() + timedelta(seconds=5) >= self.events[0].current:
-                while datetime.now() < self.events[0].current:
+            if datetime.now(timezone.utc) + timedelta(seconds=5) >= self.events[0].current:
+                while datetime.now(timezone.utc) < self.events[0].current:
                     time.sleep(0.6)
                 self._end_event_timer()
             else:
@@ -292,7 +291,7 @@ class Bot(threading.Thread):
     def _end_event_timer(self):
         """Function called at the end of the event timer"""
 
-        while len(self.events) > 0 and datetime.now() >= self.events[0].current:
+        while len(self.events) > 0 and datetime.now(timezone.utc) >= self.events[0].current:
             evt = self.events.pop(0)
             self.cnsr_queue.put_nowait(EventConsumer(evt))
             self._launch_consumers()
diff --git a/event.py b/event.py
index fc90785..857a51a 100644
--- a/event.py
+++ b/event.py
@@ -16,7 +16,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 
 class ModuleEvent:
 
@@ -77,7 +77,7 @@ class ModuleEvent:
         """Return the date of the near check"""
         if self.times != 0:
             if self._end is None:
-                self._end = datetime.now() + self.offset + self.interval
+                self._end = datetime.now(timezone.utc) + self.offset + self.interval
             return self._end
         return None
 
@@ -88,7 +88,7 @@ class ModuleEvent:
         if self.times != 0:
             if self._end is None:
                 return self.current
-            elif self._end < datetime.now():
+            elif self._end < datetime.now(timezone.utc):
                 self._end += self.interval
             return self._end
         return None
@@ -98,7 +98,7 @@ class ModuleEvent:
     def time_left(self):
         """Return the time left before/after the near check"""
         if self.current is not None:
-            return self.current - datetime.now()
+            return self.current - datetime.now(timezone.utc)
         return 99999 #TODO: 99999 is not a valid time to return
 
 
diff --git a/modules/alias.py b/modules/alias.py
index e790a86..370ac1d 100644
--- a/modules/alias.py
+++ b/modules/alias.py
@@ -4,7 +4,7 @@
 
 import re
 import sys
-from datetime import datetime
+from datetime import datetime, timezone
 
 from hooks import hook
 
@@ -41,9 +41,7 @@ def get_variable(name, msg=None):
     elif name == "chan" or name == "channel":
         return msg.channel
     elif name == "date":
-        now = datetime.now()
-        return ("%d/%d/%d %d:%d:%d"%(now.day, now.month, now.year, now.hour,
-                                     now.minute, now.second))
+        return datetime.now(timezone.utc).strftime("%c")
     elif name in DATAS.getNode("variables").index:
         return DATAS.getNode("variables").index[name]["value"]
     else:
diff --git a/modules/bonneannee.py b/modules/bonneannee.py
index f50c9b2..5597b96 100644
--- a/modules/bonneannee.py
+++ b/modules/bonneannee.py
@@ -2,7 +2,7 @@
 
 """Wishes Happy New Year when the time comes"""
 
-from datetime import datetime
+from datetime import datetime, timezone
 
 from hooks import hook
 from tools.countdown import countdown_format
@@ -11,15 +11,15 @@ nemubotversion = 3.4
 
 from more import Response
 
-yr = datetime.today().year
-yrn = datetime.today().year + 1
+yr = datetime.now(timezone.utc).year
+yrn = datetime.now(timezone.utc).year + 1
 
 def load(context):
-    d = datetime(yrn, 1, 1, 0, 0, 0) - datetime.now()
+    d = datetime(yrn, 1, 1, 0, 0, 0) - datetime.now(timezone.utc)
     add_event(ModuleEvent(interval=0, offset=d.total_seconds(), call=bonneannee))
 
 def bonneannee():
-    txt = "Bonne année %d !" % datetime.today().year
+    txt = "Bonne année %d !" % yrn
     print (txt)
     send_response("localhost:2771", Response(txt, "#epitagueule"))
     send_response("localhost:2771", Response(txt, "#yaka"))
@@ -31,7 +31,7 @@ def bonneannee():
 @hook("cmd_hook", "newyear")
 @hook("cmd_hook", str(yrn), yrn)
 def cmd_newyear(msg, yr):
-    return Response(countdown_format(datetime(yr, 1, 1, 0, 0, 1),
+    return Response(countdown_format(datetime(yr, 1, 1, 0, 0, 1, 0, timezone.utc),
                          "Il reste %s avant la nouvelle année.",
                          "Nous faisons déjà la fête depuis %s !"),
                     channel=msg.channel)
@@ -43,7 +43,7 @@ def cmd_timetoyear(msg, cur):
     if yr == cur:
         return None
 
-    return Response(countdown_format(datetime(yr, 1, 1, 0, 0, 1),
+    return Response(countdown_format(datetime(yr, 1, 1, 0, 0, 1, 0, timezone.utc),
                          "Il reste %s avant %d." % ("%s", yr),
                          "Le premier janvier %d est passé depuis %s !" % (yr, "%s")),
                     channel=msg.channel)
diff --git a/modules/events.py b/modules/events.py
index a17227c..af20867 100644
--- a/modules/events.py
+++ b/modules/events.py
@@ -5,8 +5,7 @@
 import imp
 import re
 import sys
-from datetime import timedelta
-from datetime import datetime
+from datetime import datetime, timedelta, timezone
 import time
 import threading
 import traceback
@@ -32,7 +31,7 @@ def load(context):
         if DATAS.index[evt].hasAttribute("end"):
             event = ModuleEvent(call=fini, call_data=dict(strend=DATAS.index[evt]))
             event._end = DATAS.index[evt].getDate("end")
-            idt = context.add_event(event)
+            idt = add_event(event)
             if idt is not None:
                 DATAS.index[evt]["id"] = idt
 
@@ -44,8 +43,8 @@ def fini(d, strend):
 
 @hook("cmd_hook", "goûter")
 def cmd_gouter(msg):
-    ndate = datetime.today()
-    ndate = datetime(ndate.year, ndate.month, ndate.day, 16, 42)
+    ndate = datetime.now(timezone.utc)
+    ndate = datetime(ndate.year, ndate.month, ndate.day, 16, 42, 0, 0, timezone.utc)
     return Response(countdown_format(ndate,
                              "Le goûter aura lieu dans %s, préparez vos biscuits !",
                              "Nous avons %s de retard pour le goûter :("),
@@ -53,8 +52,8 @@ def cmd_gouter(msg):
 
 @hook("cmd_hook", "week-end")
 def cmd_we(msg):
-    ndate = datetime.today() + timedelta(5 - datetime.today().weekday())
-    ndate = datetime(ndate.year, ndate.month, ndate.day, 0, 0, 1)
+    ndate = datetime.now(timezone.utc) + timedelta(5 - datetime.today().weekday())
+    ndate = datetime(ndate.year, ndate.month, ndate.day, 0, 0, 1, 0, timezone.utc)
     return Response(countdown_format(ndate,
                              "Il reste %s avant le week-end, courage ;)",
                              "Youhou, on est en week-end depuis %s."),
@@ -95,14 +94,14 @@ def start_countdown(msg):
                 if result2 is None or result2.group(4) is None: yea = now.year
                 else: yea = int(result2.group(4))
                 if result2 is not None and result3 is not None:
-                    strnd["end"] = datetime(yea, int(result2.group(3)), int(result2.group(2)), hou, minu, sec)
+                    strnd["end"] = datetime(yea, int(result2.group(3)), int(result2.group(2)), hou, minu, sec, timezone.utc)
                 elif result2 is not None:
-                  strnd["end"] = datetime(int(result2.group(4)), int(result2.group(3)), int(result2.group(2)))
+                    strnd["end"] = datetime(int(result2.group(4)), int(result2.group(3)), int(result2.group(2)), 0, 0, 0, timezone.utc)
                 elif result3 is not None:
                   if hou * 3600 + minu * 60 + sec > now.hour * 3600 + now.minute * 60 + now.second:
-                    strnd["end"] = datetime(now.year, now.month, now.day, hou, minu, sec)
+                    strnd["end"] = datetime(now.year, now.month, now.day, hou, minu, sec, timezone.utc)
                   else:
-                    strnd["end"] = datetime(now.year, now.month, now.day + 1, hou, minu, sec)
+                    strnd["end"] = datetime(now.year, now.month, now.day + 1, hou, minu, sec, timezone.utc)
                 evt._end = strnd.getDate("end")
                 strnd["id"] = add_event(evt)
             except:
diff --git a/modules/sleepytime.py b/modules/sleepytime.py
index 9cb1169..b662878 100644
--- a/modules/sleepytime.py
+++ b/modules/sleepytime.py
@@ -4,8 +4,7 @@
 
 import re
 import imp
-from datetime import datetime
-from datetime import timedelta
+from datetime import datetime, timedelta, timezone
 
 from hooks import hook
 
@@ -22,9 +21,9 @@ def cmd_sleep(msg):
                                       msg.cmds[1]) is not None:
         # First, parse the hour
         p = re.match("([0-9]{1,2})[h':.,-]([0-9]{1,2})?[m':.,-]?", msg.cmds[1])
-        f = [datetime(datetime.today().year,
-                      datetime.today().month,
-                      datetime.today().day,
+        f = [datetime(datetime.now(timezone.utc).year,
+                      datetime.now(timezone.utc).month,
+                      datetime.now(timezone.utc).day,
                       hour=int(p.group(1)))]
         if p.group(2) is not None:
              f[0] += timedelta(minutes=int(p.group(2)))
@@ -37,7 +36,7 @@ def cmd_sleep(msg):
 
     # Just get awake times
     else:
-        f = [datetime.now() + timedelta(minutes=15)]
+        f = [datetime.now(timezone.utc) + timedelta(minutes=15)]
         g = list()
         for i in range(0,6):
             f.append(f[i] + timedelta(hours=1,minutes=30))
diff --git a/modules/worldcup.py b/modules/worldcup.py
index c829bc3..cd093ab 100644
--- a/modules/worldcup.py
+++ b/modules/worldcup.py
@@ -2,7 +2,7 @@
 
 """The 2014 football worldcup module"""
 
-import datetime
+from datetime import datetime, timezone
 import json
 import re
 from urllib.parse import quote
@@ -32,7 +32,7 @@ def start_watch(msg):
     w["channel"] = msg.channel
     w["proprio"] = msg.nick
     w["sender"] = msg.sender
-    w["start"] = datetime.datetime.now()
+    w["start"] = datetime.now(timezone.utc)
     DATAS.addChild(w)
     save()
     raise IRCException("This channel is now watching world cup events!")
@@ -125,7 +125,7 @@ def txt_event(e):
     return "%se minutes : %s %s (%s)" % (e["time"], detail_event(e["type_of_event"]), e["player"], e["team"]["code"])
 
 def prettify(match):
-    matchdate_local = datetime.datetime.strptime(match["datetime"].replace(':', ''), "%Y-%m-%dT%H%M%S.%f%z")
+    matchdate_local = datetime.strptime(match["datetime"].replace(':', ''), "%Y-%m-%dT%H%M%S.%f%z")
     matchdate = matchdate_local - (matchdate_local.utcoffset() - datetime.timedelta(hours=2))
     if match["status"] == "future":
         return ["Match à venir (%s) le %s : %s vs. %s" % (match["match_number"], matchdate.strftime("%A %d à %H:%M"), match["home_team"]["country"], match["away_team"]["country"])]
@@ -135,7 +135,7 @@ def prettify(match):
         if match["status"] == "completed":
             msg += "Match (%s) du %s terminé : " % (match["match_number"], matchdate.strftime("%A %d à %H:%M"))
         else:
-            msg += "Match en cours (%s) depuis %d minutes : " % (match["match_number"], (datetime.datetime.now(matchdate.tzinfo) - matchdate_local).seconds / 60)
+            msg += "Match en cours (%s) depuis %d minutes : " % (match["match_number"], (datetime.now(matchdate.tzinfo) - matchdate_local).seconds / 60)
 
         msg += "%s %d - %d %s" % (match["home_team"]["country"], match["home_team"]["goals"], match["away_team"]["goals"], match["away_team"]["country"])
 
diff --git a/server/IRC.py b/server/IRC.py
index 2bfe3be..d676dd9 100644
--- a/server/IRC.py
+++ b/server/IRC.py
@@ -16,8 +16,10 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from datetime import datetime
+import calendar
+from datetime import datetime, timezone
 import re
+import time
 import shlex
 
 import bot
@@ -194,7 +196,7 @@ class IRCServer(SocketServer):
 
     def read(self):
         for line in SocketServer.read(self):
-            msg = IRCMessage(line, datetime.now())
+            msg = IRCMessage(line, datetime.now(timezone.utc))
 
             if msg.cmd in self.hookscmd:
                 self.hookscmd[msg.cmd](msg)
@@ -279,8 +281,7 @@ class IRCMessage:
         """Add an IRCv3.2 Message Tags"""
         # Treat special tags
         if key == "time":
-            # TODO: this is UTC timezone, nemubot works with local timezone
-            value = datetime.strptime(value, "%Y-%m-%dT%H:%M:%S.%fZ")
+            value = datetime.fromtimestamp(calendar.timegm(time.strptime(value, "%Y-%m-%dT%H:%M:%S.%fZ")), timezone.utc)
 
         # Store tag
         self.tags[key] = value
diff --git a/tools/countdown.py b/tools/countdown.py
index ed73e49..5707085 100644
--- a/tools/countdown.py
+++ b/tools/countdown.py
@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timezone
 import time
 
 def countdown(delta, resolution=5):
@@ -59,21 +59,22 @@ def countdown(delta, resolution=5):
         return sentence[1:]
 
 
-def countdown_format(date, msg_before, msg_after, timezone=None):
+def countdown_format(date, msg_before, msg_after, tz=None):
     """Replace in a text %s by a sentence incidated the remaining time before/after an event"""
-    if timezone != None:
-        os.environ['TZ'] = timezone
+    if tz != None:
+        oldtz = os.environ['TZ']
+        os.environ['TZ'] = tz
         time.tzset()
 
     #Calculate time before the date
-    if datetime.now() > date:
+    if datetime.now(timezone.utc) > date:
         sentence_c = msg_after
-        delta = datetime.now() - date
+        delta = datetime.now(timezone.utc) - date
     else:
         sentence_c = msg_before
-        delta = date - datetime.now()
+        delta = date - datetime.now(timezone.utc)
 
-    if timezone != None:
-        os.environ['TZ'] = "Europe/Paris"
+    if tz != None:
+        os.environ['TZ'] = oldtz
 
     return sentence_c % countdown(delta)
diff --git a/xmlparser/node.py b/xmlparser/node.py
index 4a674e4..10608b5 100644
--- a/xmlparser/node.py
+++ b/xmlparser/node.py
@@ -1,8 +1,7 @@
 # coding=utf-8
 
 import xml.sax
-from datetime import datetime
-from datetime import date
+from datetime import datetime, timezone
 import logging
 import sys
 import time
@@ -67,12 +66,12 @@ class ModuleState:
         return source
     else:
         try:
-            return datetime.fromtimestamp(float(source))
+            return datetime.fromtimestamp(float(source), timezone.utc)
         except ValueError:
             while True:
                 try:
                     return datetime.fromtimestamp(time.mktime(
-                        time.strptime(source[:19], "%Y-%m-%d %H:%M:%S")))
+                        time.strptime(source[:19], "%Y-%m-%d %H:%M:%S")), timezone.utc)
                 except ImportError:
                     pass