diff --git a/platypush/backend/alarm.py b/platypush/backend/alarm.py
index 8e50a140..385b3dbe 100644
--- a/platypush/backend/alarm.py
+++ b/platypush/backend/alarm.py
@@ -1,4 +1,5 @@
 import datetime
+import enum
 import os
 import time
 import threading
@@ -6,7 +7,7 @@ import threading
 from typing import Optional, Union, Dict, Any, List
 
 import croniter
-import enum
+from dateutil.tz import gettz
 
 from platypush.backend import Backend
 from platypush.context import get_bus, get_plugin
@@ -54,18 +55,19 @@ class Alarm:
         self._runtime_snooze_interval = snooze_interval
 
     def get_next(self) -> float:
-        now = time.time()
+        now = datetime.datetime.now().replace(tzinfo=gettz())
 
         try:
             cron = croniter.croniter(self.when, now)
             return cron.get_next()
         except (AttributeError, croniter.CroniterBadCronError):
             try:
-                timestamp = datetime.datetime.fromisoformat(self.when).timestamp()
+                timestamp = datetime.datetime.fromisoformat(self.when).replace(tzinfo=gettz())
             except (TypeError, ValueError):
-                timestamp = (datetime.datetime.now() + datetime.timedelta(seconds=int(self.when))).timestamp()
+                timestamp = (datetime.datetime.now().replace(tzinfo=gettz()) +
+                             datetime.timedelta(seconds=int(self.when)))
 
-            return timestamp if timestamp >= now else None
+            return timestamp.timestamp() if timestamp >= now else None
 
     def is_enabled(self):
         return self._enabled
diff --git a/setup.py b/setup.py
index 1aecaa46..35305e9b 100755
--- a/setup.py
+++ b/setup.py
@@ -163,6 +163,7 @@ setup(
         'wheel',
         'zeroconf>=0.27.0',
         'tz',
+        'python-dateutil',
     ],
 
     extras_require={
@@ -173,9 +174,9 @@ setup(
         # Support for Pushbullet backend and plugin
         'pushbullet': ['pushbullet.py @ https://github.com/rbrcsk/pushbullet.py/tarball/master'],
         # Support for HTTP backend
-        'http': ['flask', 'python-dateutil', 'frozendict', 'bcrypt'],
+        'http': ['flask', 'frozendict', 'bcrypt'],
         # Support for uWSGI HTTP backend
-        'uwsgi': ['flask', 'python-dateutil', 'frozendict', 'uwsgi', 'bcrypt'],
+        'uwsgi': ['flask', 'frozendict', 'uwsgi', 'bcrypt'],
         # Support for MQTT backends
         'mqtt': ['paho-mqtt'],
         # Support for RSS feeds parser
@@ -220,7 +221,7 @@ setup(
         # Support for serial port plugin
         'serial': ['pyserial'],
         # Support for ICal calendars
-        'ical': ['icalendar', 'python-dateutil'],
+        'ical': ['icalendar'],
         # Support for joystick backend
         'joystick': ['inputs'],
         # Support for Kodi plugin