diff --git a/tests/common.py b/tests/common.py
index 140f4060d00..b1eec13a851 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -380,10 +380,35 @@ fire_mqtt_message = threadsafe_callback_factory(async_fire_mqtt_message)
 
 
 @ha.callback
-def async_fire_time_changed(
-    hass: HomeAssistant, datetime_: datetime = None, fire_all: bool = False
+def async_fire_time_changed_exact(
+    hass: HomeAssistant, datetime_: datetime | None = None, fire_all: bool = False
 ) -> None:
-    """Fire a time changed event."""
+    """Fire a time changed event at an exact microsecond.
+
+    Consider that its not possible to actually achieve an exact microsecond
+    in production as the event loop is not precise enough. If your code
+    relies on this level of precision, consider a different approach
+    as this is only for testing.
+    """
+    if datetime_ is None:
+        utc_datetime = date_util.utcnow()
+    else:
+        utc_datetime = date_util.as_utc(datetime_)
+
+    _async_fire_time_changed(hass, utc_datetime, fire_all)
+
+
+@ha.callback
+def async_fire_time_changed(
+    hass: HomeAssistant, datetime_: datetime | None = None, fire_all: bool = False
+) -> None:
+    """Fire a time changed event.
+
+    This function will ensure microseconds at at least 500000
+    to account for the synchronization repeating listeners.
+
+    If you need to fire an exact microsecond, use async_fire_time_changed_exact.
+    """
     if datetime_ is None:
         utc_datetime = date_util.utcnow()
     else:
@@ -396,8 +421,14 @@ def async_fire_time_changed(
         # staggering to avoid thundering herd.
         utc_datetime = utc_datetime.replace(microsecond=500000)
 
-    timestamp = date_util.utc_to_timestamp(utc_datetime)
+    _async_fire_time_changed(hass, utc_datetime, fire_all)
 
+
+@ha.callback
+def _async_fire_time_changed(
+    hass: HomeAssistant, utc_datetime: datetime | None, fire_all: bool
+) -> None:
+    timestamp = date_util.utc_to_timestamp(utc_datetime)
     for task in list(hass.loop._scheduled):
         if not isinstance(task, asyncio.TimerHandle):
             continue
diff --git a/tests/components/litejet/test_trigger.py b/tests/components/litejet/test_trigger.py
index a06d490cea6..152d11b0c23 100644
--- a/tests/components/litejet/test_trigger.py
+++ b/tests/components/litejet/test_trigger.py
@@ -12,7 +12,7 @@ import homeassistant.util.dt as dt_util
 
 from . import async_init_integration
 
-from tests.common import async_fire_time_changed, async_mock_service
+from tests.common import async_fire_time_changed_exact, async_mock_service
 from tests.components.blueprint.conftest import stub_blueprint_populate  # noqa: F401
 
 _LOGGER = logging.getLogger(__name__)
@@ -66,7 +66,7 @@ async def simulate_time(hass, mock_litejet, delta):
         return_value=mock_litejet.start_time + delta,
     ):
         _LOGGER.info("now=%s", dt_util.utcnow())
-        async_fire_time_changed(hass, mock_litejet.start_time + delta)
+        async_fire_time_changed_exact(hass, mock_litejet.start_time + delta)
         await hass.async_block_till_done()
         _LOGGER.info("done with now=%s", dt_util.utcnow())