diff --git a/homeassistant/components/time_date/sensor.py b/homeassistant/components/time_date/sensor.py
index 86ff3531240..e8e7d38fe35 100644
--- a/homeassistant/components/time_date/sensor.py
+++ b/homeassistant/components/time_date/sensor.py
@@ -100,10 +100,13 @@ class TimeDateSensor(Entity):
             return now + timedelta(seconds=86400)
 
         if self.type == "beat":
+            # Add 1 hour because @0 beats is at 23:00:00 UTC.
+            timestamp = dt_util.as_timestamp(now + timedelta(hours=1))
             interval = 86.4
         else:
+            timestamp = dt_util.as_timestamp(now)
             interval = 60
-        timestamp = int(dt_util.as_timestamp(now))
+
         delta = interval - (timestamp % interval)
         next_interval = now + timedelta(seconds=delta)
         _LOGGER.debug("%s + %s -> %s (%s)", now, delta, next_interval, self.type)
diff --git a/tests/components/time_date/test_sensor.py b/tests/components/time_date/test_sensor.py
index bf55ea8075b..8b8695a2879 100644
--- a/tests/components/time_date/test_sensor.py
+++ b/tests/components/time_date/test_sensor.py
@@ -20,16 +20,16 @@ def restore_ts():
 async def test_intervals(hass):
     """Test timing intervals of sensors."""
     device = time_date.TimeDateSensor(hass, "time")
-    now = dt_util.utc_from_timestamp(45)
+    now = dt_util.utc_from_timestamp(45.5)
     with patch("homeassistant.util.dt.utcnow", return_value=now):
         next_time = device.get_next_interval()
     assert next_time == dt_util.utc_from_timestamp(60)
 
     device = time_date.TimeDateSensor(hass, "beat")
-    now = dt_util.utc_from_timestamp(29)
+    now = dt_util.parse_datetime("2020-11-13 00:00:29+01:00")
     with patch("homeassistant.util.dt.utcnow", return_value=now):
         next_time = device.get_next_interval()
-    assert next_time == dt_util.utc_from_timestamp(86.4)
+    assert next_time == dt_util.parse_datetime("2020-11-13 00:01:26.4+01:00")
 
     device = time_date.TimeDateSensor(hass, "date_time")
     now = dt_util.utc_from_timestamp(1495068899)