diff --git a/homeassistant/components/recorder/models.py b/homeassistant/components/recorder/models.py
index 6edee252ea3..38b03eb824e 100644
--- a/homeassistant/components/recorder/models.py
+++ b/homeassistant/components/recorder/models.py
@@ -55,6 +55,10 @@ SCHEMA_VERSION = 28
 
 _LOGGER = logging.getLogger(__name__)
 
+# EPOCHORDINAL is not exposed as a constant
+# https://github.com/python/cpython/blob/3.10/Lib/zoneinfo/_zoneinfo.py#L12
+EPOCHORDINAL = datetime(1970, 1, 1).toordinal()
+
 DB_TIMEZONE = "+00:00"
 
 TABLE_EVENTS = "events"
@@ -630,10 +634,22 @@ def process_timestamp_to_utc_isoformat(ts: datetime | None) -> str | None:
 
 
 def process_datetime_to_timestamp(ts: datetime) -> float:
-    """Process a timestamp into a unix timestamp."""
-    if ts.tzinfo == dt_util.UTC:
-        return ts.timestamp()
-    return ts.replace(tzinfo=dt_util.UTC).timestamp()
+    """Process a datebase datetime to epoch.
+
+    Mirrors the behavior of process_timestamp_to_utc_isoformat
+    except it returns the epoch time.
+    """
+    if ts.tzinfo is None:
+        # Taken from
+        # https://github.com/python/cpython/blob/3.10/Lib/zoneinfo/_zoneinfo.py#L185
+        return (
+            (ts.toordinal() - EPOCHORDINAL) * 86400
+            + ts.hour * 3600
+            + ts.minute * 60
+            + ts.second
+            + (ts.microsecond / 1000000)
+        )
+    return ts.timestamp()
 
 
 class LazyState(State):
diff --git a/tests/components/recorder/test_models.py b/tests/components/recorder/test_models.py
index 874d84ef2ad..ca68d5951d8 100644
--- a/tests/components/recorder/test_models.py
+++ b/tests/components/recorder/test_models.py
@@ -2,6 +2,7 @@
 from datetime import datetime, timedelta
 from unittest.mock import PropertyMock
 
+from freezegun import freeze_time
 import pytest
 from sqlalchemy import create_engine
 from sqlalchemy.orm import scoped_session, sessionmaker
@@ -14,6 +15,7 @@ from homeassistant.components.recorder.models import (
     RecorderRuns,
     StateAttributes,
     States,
+    process_datetime_to_timestamp,
     process_timestamp,
     process_timestamp_to_utc_isoformat,
 )
@@ -333,3 +335,73 @@ async def test_lazy_state_handles_same_last_updated_and_last_changed(caplog):
         "last_updated": "2020-06-12T03:04:01.000323+00:00",
         "state": "off",
     }
+
+
+@pytest.mark.parametrize(
+    "time_zone", ["Europe/Berlin", "America/Chicago", "US/Hawaii", "UTC"]
+)
+def test_process_datetime_to_timestamp(time_zone, hass):
+    """Test we can handle processing database datatimes to timestamps."""
+    hass.config.set_time_zone(time_zone)
+    utc_now = dt_util.utcnow()
+    assert process_datetime_to_timestamp(utc_now) == utc_now.timestamp()
+    now = dt_util.now()
+    assert process_datetime_to_timestamp(now) == now.timestamp()
+
+
+@pytest.mark.parametrize(
+    "time_zone", ["Europe/Berlin", "America/Chicago", "US/Hawaii", "UTC"]
+)
+def test_process_datetime_to_timestamp_freeze_time(time_zone, hass):
+    """Test we can handle processing database datatimes to timestamps.
+
+    This test freezes time to make sure everything matches.
+    """
+    hass.config.set_time_zone(time_zone)
+    utc_now = dt_util.utcnow()
+    with freeze_time(utc_now):
+        epoch = utc_now.timestamp()
+        assert process_datetime_to_timestamp(dt_util.utcnow()) == epoch
+        now = dt_util.now()
+        assert process_datetime_to_timestamp(now) == epoch
+
+
+@pytest.mark.parametrize(
+    "time_zone", ["Europe/Berlin", "America/Chicago", "US/Hawaii", "UTC"]
+)
+async def test_process_datetime_to_timestamp_mirrors_utc_isoformat_behavior(
+    time_zone, hass
+):
+    """Test process_datetime_to_timestamp mirrors process_timestamp_to_utc_isoformat."""
+    hass.config.set_time_zone(time_zone)
+    datetime_with_tzinfo = datetime(2016, 7, 9, 11, 0, 0, tzinfo=dt.UTC)
+    datetime_without_tzinfo = datetime(2016, 7, 9, 11, 0, 0)
+    est = dt_util.get_time_zone("US/Eastern")
+    datetime_est_timezone = datetime(2016, 7, 9, 11, 0, 0, tzinfo=est)
+    est = dt_util.get_time_zone("US/Eastern")
+    datetime_est_timezone = datetime(2016, 7, 9, 11, 0, 0, tzinfo=est)
+    nst = dt_util.get_time_zone("Canada/Newfoundland")
+    datetime_nst_timezone = datetime(2016, 7, 9, 11, 0, 0, tzinfo=nst)
+    hst = dt_util.get_time_zone("US/Hawaii")
+    datetime_hst_timezone = datetime(2016, 7, 9, 11, 0, 0, tzinfo=hst)
+
+    assert (
+        process_datetime_to_timestamp(datetime_with_tzinfo)
+        == dt_util.parse_datetime("2016-07-09T11:00:00+00:00").timestamp()
+    )
+    assert (
+        process_datetime_to_timestamp(datetime_without_tzinfo)
+        == dt_util.parse_datetime("2016-07-09T11:00:00+00:00").timestamp()
+    )
+    assert (
+        process_datetime_to_timestamp(datetime_est_timezone)
+        == dt_util.parse_datetime("2016-07-09T15:00:00+00:00").timestamp()
+    )
+    assert (
+        process_datetime_to_timestamp(datetime_nst_timezone)
+        == dt_util.parse_datetime("2016-07-09T13:30:00+00:00").timestamp()
+    )
+    assert (
+        process_datetime_to_timestamp(datetime_hst_timezone)
+        == dt_util.parse_datetime("2016-07-09T21:00:00+00:00").timestamp()
+    )