diff --git a/homeassistant/components/octoprint/sensor.py b/homeassistant/components/octoprint/sensor.py
index 4efc094c297..ad493022dfc 100644
--- a/homeassistant/components/octoprint/sensor.py
+++ b/homeassistant/components/octoprint/sensor.py
@@ -187,7 +187,9 @@ class OctoPrintEstimatedFinishTimeSensor(OctoPrintSensorBase):
 
         read_time = self.coordinator.data["last_read_time"]
 
-        return read_time + timedelta(seconds=job.progress.print_time_left)
+        return (read_time + timedelta(seconds=job.progress.print_time_left)).replace(
+            second=0
+        )
 
 
 class OctoPrintStartTimeSensor(OctoPrintSensorBase):
@@ -215,7 +217,9 @@ class OctoPrintStartTimeSensor(OctoPrintSensorBase):
 
         read_time = self.coordinator.data["last_read_time"]
 
-        return read_time - timedelta(seconds=job.progress.print_time)
+        return (read_time - timedelta(seconds=job.progress.print_time)).replace(
+            second=0
+        )
 
 
 class OctoPrintTemperatureSensor(OctoPrintSensorBase):
diff --git a/tests/components/octoprint/test_sensor.py b/tests/components/octoprint/test_sensor.py
index 5f8a0edd373..873cd80e842 100644
--- a/tests/components/octoprint/test_sensor.py
+++ b/tests/components/octoprint/test_sensor.py
@@ -23,7 +23,7 @@ async def test_sensors(hass):
     }
     with patch(
         "homeassistant.util.dt.utcnow",
-        return_value=datetime(2020, 2, 20, 9, 10, 0, tzinfo=timezone.utc),
+        return_value=datetime(2020, 2, 20, 9, 10, 13, 543, tzinfo=timezone.utc),
     ):
         await init_integration(hass, "sensor", printer=printer, job=job)