diff --git a/homeassistant/components/history/websocket_api.py b/homeassistant/components/history/websocket_api.py
index 25422004797..f903a9904a9 100644
--- a/homeassistant/components/history/websocket_api.py
+++ b/homeassistant/components/history/websocket_api.py
@@ -179,8 +179,8 @@ def _generate_stream_message(
     """Generate a history stream message response."""
     return {
         "states": states,
-        "start_time": dt_util.utc_to_timestamp(start_day),
-        "end_time": dt_util.utc_to_timestamp(end_day),
+        "start_time": start_day.timestamp(),
+        "end_time": end_day.timestamp(),
     }
 
 
diff --git a/homeassistant/components/logbook/queries/__init__.py b/homeassistant/components/logbook/queries/__init__.py
index 29d89a4c22f..af41374ec9b 100644
--- a/homeassistant/components/logbook/queries/__init__.py
+++ b/homeassistant/components/logbook/queries/__init__.py
@@ -9,7 +9,6 @@ from sqlalchemy.sql.lambdas import StatementLambdaElement
 from homeassistant.components.recorder.filters import Filters
 from homeassistant.components.recorder.models import ulid_to_bytes_or_none
 from homeassistant.helpers.json import json_dumps
-from homeassistant.util import dt as dt_util
 
 from .all import all_stmt
 from .devices import devices_stmt
@@ -28,8 +27,8 @@ def statement_for_request(
     context_id: str | None = None,
 ) -> StatementLambdaElement:
     """Generate the logbook statement for a logbook request."""
-    start_day = dt_util.utc_to_timestamp(start_day_dt)
-    end_day = dt_util.utc_to_timestamp(end_day_dt)
+    start_day = start_day_dt.timestamp()
+    end_day = end_day_dt.timestamp()
     # No entities: logbook sends everything for the timeframe
     # limited by the context_id and the yaml configured filter
     if not entity_ids and not device_ids:
diff --git a/homeassistant/components/logbook/websocket_api.py b/homeassistant/components/logbook/websocket_api.py
index 82124247adf..0b1b34ca375 100644
--- a/homeassistant/components/logbook/websocket_api.py
+++ b/homeassistant/components/logbook/websocket_api.py
@@ -184,8 +184,8 @@ def _generate_stream_message(
     """Generate a logbook stream message response."""
     return {
         "events": events,
-        "start_time": dt_util.utc_to_timestamp(start_day),
-        "end_time": dt_util.utc_to_timestamp(end_day),
+        "start_time": start_day.timestamp(),
+        "end_time": end_day.timestamp(),
     }
 
 
diff --git a/homeassistant/components/recorder/purge.py b/homeassistant/components/recorder/purge.py
index 0b63bb8daa2..a9d8c0b2482 100644
--- a/homeassistant/components/recorder/purge.py
+++ b/homeassistant/components/recorder/purge.py
@@ -10,8 +10,6 @@ from typing import TYPE_CHECKING
 
 from sqlalchemy.orm.session import Session
 
-import homeassistant.util.dt as dt_util
-
 from .db_schema import Events, States, StatesMeta
 from .models import DatabaseEngine
 from .queries import (
@@ -251,7 +249,7 @@ def _select_state_attributes_ids_to_purge(
     state_ids = set()
     attributes_ids = set()
     for state_id, attributes_id in session.execute(
-        find_states_to_purge(dt_util.utc_to_timestamp(purge_before), max_bind_vars)
+        find_states_to_purge(purge_before.timestamp(), max_bind_vars)
     ).all():
         state_ids.add(state_id)
         if attributes_id:
@@ -271,7 +269,7 @@ def _select_event_data_ids_to_purge(
     event_ids = set()
     data_ids = set()
     for event_id, data_id in session.execute(
-        find_events_to_purge(dt_util.utc_to_timestamp(purge_before), max_bind_vars)
+        find_events_to_purge(purge_before.timestamp(), max_bind_vars)
     ).all():
         event_ids.add(event_id)
         if data_id:
@@ -464,7 +462,7 @@ def _select_legacy_detached_state_and_attributes_and_data_ids_to_purge(
     """
     states = session.execute(
         find_legacy_detached_states_and_attributes_to_purge(
-            dt_util.utc_to_timestamp(purge_before), max_bind_vars
+            purge_before.timestamp(), max_bind_vars
         )
     ).all()
     _LOGGER.debug("Selected %s state ids to remove", len(states))
@@ -489,7 +487,7 @@ def _select_legacy_event_state_and_attributes_and_data_ids_to_purge(
     """
     events = session.execute(
         find_legacy_event_state_and_attributes_and_data_ids_to_purge(
-            dt_util.utc_to_timestamp(purge_before), max_bind_vars
+            purge_before.timestamp(), max_bind_vars
         )
     ).all()
     _LOGGER.debug("Selected %s event ids to remove", len(events))
diff --git a/homeassistant/core.py b/homeassistant/core.py
index 004c0dc1ede..047f46afdf5 100644
--- a/homeassistant/core.py
+++ b/homeassistant/core.py
@@ -1077,9 +1077,7 @@ class Event:
         self.origin = origin
         self.time_fired = time_fired or dt_util.utcnow()
         if not context:
-            context = Context(
-                id=ulid_at_time(dt_util.utc_to_timestamp(self.time_fired))
-            )
+            context = Context(id=ulid_at_time(self.time_fired.timestamp()))
         self.context = context
         if not context.origin_event:
             context.origin_event = self
diff --git a/homeassistant/helpers/event.py b/homeassistant/helpers/event.py
index ea80591a989..b109ce16698 100644
--- a/homeassistant/helpers/event.py
+++ b/homeassistant/helpers/event.py
@@ -1442,7 +1442,7 @@ def async_track_point_in_utc_time(
     """
     # Ensure point_in_time is UTC
     utc_point_in_time = dt_util.as_utc(point_in_time)
-    expected_fire_timestamp = dt_util.utc_to_timestamp(utc_point_in_time)
+    expected_fire_timestamp = utc_point_in_time.timestamp()
     job = (
         action
         if isinstance(action, HassJob)