diff -r 173d9d7048b6 -r 6993964140bd borgend/scheduler.py
--- a/borgend/scheduler.py	Tue Feb 06 20:55:53 2018 +0000
+++ b/borgend/scheduler.py	Wed Feb 07 20:39:01 2018 +0000
@@ -154,28 +154,26 @@
         with self._cond:
             while not self._terminate:
                 snapshot = dreamtime.Snapshot()
-                now = snapshot.monotonic()
                 if not self._list:
                     timeout = None
-                    delta = None
+                    delta = math.inf
                     nextname = None
                 else:
                     nextname=self._list.name
-                    delta = self._list.when.horizon(snapshot)-now
+                    delta = self._list.when.horizon(snapshot)
                     if delta==math.inf:
                         timeout=None
                     else:
                         timeout = min(self.precision, delta)
 
                 if not timeout or timeout>0:
-                    logger.debug("Scheduler waiting %s seconds [next event '%s' in %s seconds]"
-                                 % (str(timeout), nextname, str(delta)))
+                    logger.debug("Scheduler waiting %s seconds [next event '%s' in %0.2f seconds]"
+                                 % (str(timeout), nextname, delta))
                     self._cond.wait(timeout)
                     snapshot = dreamtime.Snapshot()
-                    now = snapshot.monotonic()
                     logger.debug("Scheduler timed out")
 
-                while self._list and self._list.when.horizon(snapshot) <= now:
+                while self._list and self._list.when.horizon(snapshot) <= 0:
                     ev=self._list
                     logger.debug("Scheduler activating %s" % (ev.name or "(unknown)"))
                     # We are only allowed to remove ev from list when ev.cond allows
@@ -217,7 +215,7 @@
     # cond has to be acquired on entry!
     def wait_until(self, when, cond, name=None):
         logger.info("Scheduling '%s' in %0.01f seconds / on %s [%s]" %
-                    (name, when.seconds_to(), when.isoformat(),
+                    (name, when.remaining(), when.isoformat(),
                      when.__class__.__name__))
         self._wait(ScheduledEvent(when, cond, name))