diff --git a/tests/helpers/test_trigger_template_entity.py b/tests/helpers/test_trigger_template_entity.py
index 8389218054d..d221f65f4b5 100644
--- a/tests/helpers/test_trigger_template_entity.py
+++ b/tests/helpers/test_trigger_template_entity.py
@@ -4,7 +4,10 @@ from typing import Any
 
 import pytest
 
+from homeassistant.components.sensor import SensorDeviceClass
+from homeassistant.components.sensor.helpers import async_parse_date_datetime
 from homeassistant.const import (
+    CONF_DEVICE_CLASS,
     CONF_ICON,
     CONF_NAME,
     CONF_STATE,
@@ -20,6 +23,7 @@ from homeassistant.helpers.trigger_template_entity import (
     CONF_AVAILABILITY,
     CONF_PICTURE,
     ManualTriggerEntity,
+    ManualTriggerSensorEntity,
     ValueTemplate,
 )
 
@@ -288,3 +292,40 @@ async def test_trigger_template_complex(hass: HomeAssistant) -> None:
     await hass.async_block_till_done()
 
     assert entity.some_other_key == {"test_key": "test_data"}
+
+
+async def test_manual_trigger_sensor_entity_with_date(
+    hass: HomeAssistant, caplog: pytest.LogCaptureFixture
+) -> None:
+    """Test manual trigger template entity when availability template isn't used."""
+    config = {
+        CONF_NAME: template.Template("test_entity", hass),
+        CONF_STATE: template.Template("{{ as_datetime(value) }}", hass),
+        CONF_DEVICE_CLASS: SensorDeviceClass.TIMESTAMP,
+    }
+
+    class TestEntity(ManualTriggerSensorEntity):
+        """Test entity class."""
+
+        extra_template_keys = (CONF_STATE,)
+
+        @property
+        def state(self) -> bool | None:
+            """Return extra attributes."""
+            return "2025-01-01T00:00:00+00:00"
+
+    entity = TestEntity(hass, config)
+    entity.entity_id = "test.entity"
+    variables = entity._template_variables_with_value("2025-01-01T00:00:00+00:00")
+    assert entity._render_availability_template(variables) is True
+    assert entity.available is True
+    entity._set_value_with_possible_timestamp(
+        entity.state, entity.device_class, variables
+    )
+    await hass.async_block_till_done()
+
+    assert entity.native_value == async_parse_date_datetime(
+        "2025-01-01T00:00:00+00:00", entity.entity_id, entity.device_class
+    )
+    assert entity.state == "2025-01-01T00:00:00+00:00"
+    assert entity.device_class == SensorDeviceClass.TIMESTAMP