diff --git a/icinga_host_notify.py b/icinga_host_notify.py
index 79b5a21..eba3ef2 100755
--- a/icinga_host_notify.py
+++ b/icinga_host_notify.py
@@ -4,42 +4,49 @@ import logging
 import os
 from pydbus import SystemBus
 from gi.repository import GLib
+from datetime import datetime
 import sms_functions
 
 def assemble_sms():
+    since_date = datetime.fromtimestamp(int(os.environ.get('LASTSTATECHANGE')))
+
     str_list = []
     str_list.append("Icinga {}\n".format(os.environ.get('NOTIFICATIONTYPE')))
     str_list.append("{} is {} [{}]\n".format(os.environ.get('HOSTALIAS'), os.environ.get('HOSTSTATE'), os.environ.get('HOSTADDRESS')))
-    str_list.append("since {}\n".format(os.environ.get('LASTSTATECHANGE')))
+    str_list.append("since {}\n".format(since_date.strftime('%Y-%m-%dT%H:%M:%S')))
     str_list.append("Comment: [{}] {}".format(os.environ.get('NOTIFICATIONAUTHORNAME'), os.environ.get('NOTIFICATIONCOMMENT')))
     return ''.join(str_list)
 
-# Setup logging
-logfile = "/opt/sms/sms.log"
-FORMAT = '%(asctime)-15s %(message)s'
-logging.basicConfig(format=FORMAT,filename=logfile,level=10)
-logger = logging.getLogger('observiumsms')
+def main():
+    # Setup logging
+    logfile = "/opt/sms/sms.log"
+    FORMAT = '%(asctime)-15s %(message)s'
+    logging.basicConfig(format=FORMAT,filename=logfile,level=10)
+    logger = logging.getLogger('observiumsms')
+    
+    # check param
+    smsrcpt = os.environ.get('USERMOBILE')
+    if not smsrcpt:
+        logger.error('No SMS number given')
+        raise Exception('No SMS number given for message')
+    
+    # Assemble SMS
+    smsstring = assemble_sms()
+    logger.info("Sending SMS: %s", smsstring)
+    
+    success = False
+    retries = 0
+    max_retries = 3
+    
+    while not success and retries < max_retries:
+        retries += 1
+        try:
+            # Contact ModemManager, unlock SIM and send SMS to emergency numbers
+            sms_functions.send_sms([ smsrcpt ], smsstring)
+        except sms_functions.ModemManagerError as err:
+            logger.error('Error when sending SMS: {0}'.format(e.value))
+        else:
+            success = True
 
-# check param
-smsrcpt = os.environ.get('USERMOBILE')
-if not smsrcpt:
-    logger.error('No SMS number given')
-    raise Exception('No SMS number given for message')
-
-# Assemble SMS
-smsstring = assemble_sms()
-logger.info("Sending SMS: %s", smsstring)
-
-success = False
-retries = 0
-max_retries = 3
-
-while not success and retries < max_retries:
-    retries += 1
-    try:
-        # Contact ModemManager, unlock SIM and send SMS to emergency numbers
-        sms_functions.send_sms([ smsrcpt ], smsstring)
-    except sms_functions.ModemManagerError as err:
-        logger.error('Error when sending SMS: {0}'.format(e.value))
-    else:
-        success = True
+if __name__ == "__main__":
+    main()