diff --git a/linspector/core/periods.py b/linspector/core/periods.py
new file mode 100644
index 0000000..ff4bcd2
--- /dev/null
+++ b/linspector/core/periods.py
@@ -0,0 +1,96 @@
+"""
+This file is part of Linspector (https://linspector.org/)
+Copyright (c) 2022 Johannes Findeisen <you@hanez.org>. All Rights Reserved.
+See LICENSE (MIT license)
+"""
+from logging import getLogger
+from apscheduler.util import convert_to_datetime
+
+logger = getLogger('linspector')
+
+
+class Period(object):
+    def __init__(self, name):
+        self.name = name
+    
+    def get_name(self):
+        return self.name
+
+
+class IntervalPeriod(Period):
+    def __init__(self, name="", weeks=0, days=0, hours=0, minutes=0, seconds=0, start_date=None,
+                 comment=None):
+        super().__init__(name)
+        
+        self.days = days                  # number of days to wait
+        self.weeks = weeks                # number of weeks to wait
+        self.hours = hours                # number of hours to wait
+        self.minutes = minutes            # number of minutes to wait
+        self.seconds = seconds            # number of seconds to wait
+        self.start_date = start_date      # when to first execute 
+        self.comment = comment            # comment
+        
+    #def createJob(self, scheduler, jobInfo, func, **kwargs):
+    #    start_date = self.start_date
+    #    if "start_date" in kwargs:
+    #        start_date = kwargs["start_date"]
+
+    #    return scheduler.add_job(func, trigger="interval", weeks=self.weeks, hours=self.hours, minutes=self.minutes,
+    #                                      seconds=self.seconds, start_date=start_date, args=[jobInfo], timezone="CET")
+
+    def __str__(self):
+        ret = "IntervalPeriod(Name: " + self.name + ")"
+        return ret    
+
+
+class CronPeriod(Period):
+    def __init__(self, name="", year="*", month="*", day="*", week="*", day_of_week="*", hour="*", minute="*",
+                 second="0", start_date=None, comment=None):
+        super(CronPeriod, self).__init__(name)
+        self.year = year                # 4-digit year number
+        self.month = month              # month number (1-12)
+        self.day = day                  # day of the month (1-31)
+        self.week = week                # ISO week number (1-53)
+        self.day_of_week = day_of_week  # number or name of weekday (0-6 or mon,tue,wed,thu,fri,sat,sun)
+        self.hour = hour                # hour (0-23)
+        self.minute = minute            # minute (0-59)
+        self.second = second            # second (0-59)
+        self.start_date = start_date
+        self.comment = comment
+
+    def __str__(self):
+        ret = "CronPeriod(Name: " + self.name + ")"
+        return ret
+        
+    #def createJob(self, scheduler, jobInfo, func, **kwargs):
+    #    start_date = self.start_date
+
+     #   if "start_date" in kwargs:
+     #       start_date = kwargs["start_date"]
+
+     #   return scheduler.add_job(func, trigger="cron", year=self.year, month=self.month, day=self.day, week=self.week,
+     #                                 day_of_week=self.day_of_week, hour=self.hour, minute=self.minute,
+     #                                 second=self.second, start_date=start_date, args=[jobInfo])
+            
+        
+class DatePeriod(Period):
+    def __init__(self, name, date, comment=None):
+        super(DatePeriod, self).__init__(name)
+        self.date = date
+        self.comment = comment
+
+    def __str__(self):
+        ret = "DatePeriod(Name: " + self.name + ", " + str(self.date) + ")"
+        return ret
+        
+    #def createJob(self, scheduler, jobInfo, func, **kwargs):
+    #    try:
+    #        if "start_date" in kwargs:
+    #            earliest = kwargs["start_date"]
+    #            date = convert_to_datetime(self.date)
+    #            if date < earliest:
+    #                self.date = earliest
+
+    #        return scheduler.add_job(func=func, trigger="date", date=self.date, args=[jobInfo])
+    #    except Exception, e:
+    #        logger.error("exception while creating job out of DatePeriod!\n%s" % e)