diff --git a/booking_service.py b/booking_service.py
index eff0cf1..f3c76b1 100755
--- a/booking_service.py
+++ b/booking_service.py
@@ -6,7 +6,7 @@ import logging
 import uvloop
 import click
 
-from punkow.service import interface, model, worker
+from punkow.service import interface, model, worker, timer
 
 
 @click.command()
@@ -15,7 +15,9 @@ from punkow.service import interface, model, worker
 @click.option("--db", default="sqlite:////tmp/punkow.db", help="The database uri")
 @click.option("--interval", default=50 * 5, type=int, help="The interval in which the worker should operate")
 @click.option("--debug", is_flag=True, help="Run in debug mode")
-def main(host, port, db, interval, debug):
+@click.option("--tz", default="CET", help="Timezone to use for special times")
+@click.option("--special", help="special time where the interval should be increased", multiple=True)
+def main(host, port, db, interval, debug, tz, special):
     asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
 
     loop = asyncio.get_event_loop()
@@ -33,7 +35,9 @@ def main(host, port, db, interval, debug):
     db_mngr = model.DatabaseManager(db)
     db_mngr.create_schema()
 
-    wrk = worker.Worker(loop, db_mngr, interval=interval, debug=debug)
+    tm = timer.Timer(interval=interval, special_times=special, time_zone=tz)
+
+    wrk = worker.Worker(loop, db_mngr, tm=tm, debug=debug)
     loop.create_task(wrk.run())
 
     app = interface.App(db_mngr)
diff --git a/punkow/service/worker.py b/punkow/service/worker.py
index 3860221..4998fc6 100644
--- a/punkow/service/worker.py
+++ b/punkow/service/worker.py
@@ -8,7 +8,7 @@ import typing
 from sqlalchemy import func
 from sqlalchemy.orm import joinedload
 
-from . import model
+from . import model, timer
 from .. import scraper
 
 logger = logging.getLogger(__name__)
@@ -72,10 +72,10 @@ def _book(target: str, reqs: typing.List[_WorkerRequest], debug=False) -> typing
 
 class Worker(object):
 
-    def __init__(self, loop: asyncio.AbstractEventLoop, db: model.DatabaseManager, interval=5 * 60, debug=True):
+    def __init__(self, loop: asyncio.AbstractEventLoop, db: model.DatabaseManager, tm: timer.Timer, debug=True):
         self._loop = loop
         self._db = db
-        self._interval = interval
+        self._timer = tm
         self._debug = debug
         self._executor = concurrent.futures.ProcessPoolExecutor(max_workers=1)
 
@@ -150,10 +150,5 @@ class Worker(object):
 
     async def run(self):
         while True:
-            start = datetime.datetime.utcnow()
-            await self._run_once()
-            end = datetime.datetime.utcnow()
-            elapsed = (end - start).total_seconds()
-            sleep = max(0.0, self._interval - elapsed)
-            logger.debug("Booking run completed in %0.2f seconds - now sleep for %0.2f seconds", elapsed, sleep)
-            await asyncio.sleep(sleep)
+            with self._timer.timed():
+                await self._run_once()