diff --git a/homeassistant/components/scheduler/sun.py b/homeassistant/components/scheduler/sun.py
index cabe69063b2..5af965a1764 100644
--- a/homeassistant/components/scheduler/sun.py
+++ b/homeassistant/components/scheduler/sun.py
@@ -95,8 +95,8 @@ class SunsetEventListener(SunEventListener):
         next_time = self.schedule_next_event(hass, next_setting)
 
         _LOGGER.info(
-            'SunsetEventListener scheduled for {}, will call service {}.{}'
-            .format(next_time, self.domain, self.service))
+            'SunsetEventListener scheduled for %s, will call service %s.%s',
+            next_time, self.domain, self.service)
 
 
 # pylint: disable=too-few-public-methods
@@ -110,5 +110,5 @@ class SunriseEventListener(SunEventListener):
         next_time = self.schedule_next_event(hass, next_rising)
 
         _LOGGER.info(
-            'SunriseEventListener scheduled for {}, will call service {}.{}'
-            .format(next_time, self.domain, self.service))
+            'SunriseEventListener scheduled for %s, will call service %s.%s',
+            next_time, self.domain, self.service)
diff --git a/homeassistant/components/scheduler/time.py b/homeassistant/components/scheduler/time.py
index 30f1ddf152f..c1d8ebb7845 100644
--- a/homeassistant/components/scheduler/time.py
+++ b/homeassistant/components/scheduler/time.py
@@ -65,5 +65,5 @@ class TimeEventListener(ServiceEventListener):
         hass.track_point_in_time(execute, next_time)
 
         _LOGGER.info(
-            'TimeEventListener scheduled for {}, will call service {}.{}'
-            .format(next_time, self.domain, self.service))
+            'TimeEventListener scheduled for %s, will call service %s.%s',
+            next_time, self.domain, self.service)