diff --git a/supervisor/coresys.py b/supervisor/coresys.py
index 958209dfa..daab10f68 100644
--- a/supervisor/coresys.py
+++ b/supervisor/coresys.py
@@ -9,6 +9,7 @@ from datetime import UTC, datetime, tzinfo
 from functools import partial
 import logging
 import os
+import time
 from types import MappingProxyType
 from typing import TYPE_CHECKING, Any, Self, TypeVar
 
@@ -655,8 +656,14 @@ class CoreSys:
         if kwargs:
             funct = partial(funct, **kwargs)
 
+        # Convert datetime to event loop time base
+        # If datetime is in the past, delay will be negative and call_at will
+        # schedule the call as soon as possible.
+        delay = when.timestamp() - time.time()
+        loop_time = self.loop.time() + delay
+
         return self.loop.call_at(
-            when.timestamp(), funct, *args, context=self._create_context()
+            loop_time, funct, *args, context=self._create_context()
         )
 
 
diff --git a/tests/jobs/test_job_decorator.py b/tests/jobs/test_job_decorator.py
index 40bbdfae1..3cce977ec 100644
--- a/tests/jobs/test_job_decorator.py
+++ b/tests/jobs/test_job_decorator.py
@@ -1179,7 +1179,6 @@ async def test_job_scheduled_delay(coresys: CoreSys):
 
 async def test_job_scheduled_at(coresys: CoreSys):
     """Test job that schedules a job to start at a specified time."""
-    dt = datetime.now()
 
     class TestClass:
         """Test class."""
@@ -1189,10 +1188,12 @@ async def test_job_scheduled_at(coresys: CoreSys):
             self.coresys = coresys
 
         @Job(name="test_job_scheduled_at_job_scheduler")
-        async def job_scheduler(self) -> tuple[SupervisorJob, asyncio.TimerHandle]:
+        async def job_scheduler(
+            self, scheduled_time: datetime
+        ) -> tuple[SupervisorJob, asyncio.TimerHandle]:
             """Schedule a job to run at specified time."""
             return self.coresys.jobs.schedule_job(
-                self.job_task, JobSchedulerOptions(start_at=dt + timedelta(seconds=0.1))
+                self.job_task, JobSchedulerOptions(start_at=scheduled_time)
             )
 
         @Job(name="test_job_scheduled_at_job_task")
@@ -1201,29 +1202,28 @@ async def test_job_scheduled_at(coresys: CoreSys):
             self.coresys.jobs.current.stage = "work"
 
     test = TestClass(coresys)
-    job_started = asyncio.Event()
-    job_ended = asyncio.Event()
+
+    # Schedule job to run 0.1 seconds from now
+    scheduled_time = datetime.now() + timedelta(seconds=0.1)
+    job, _ = await test.job_scheduler(scheduled_time)
+    started = False
+    ended = False
 
     async def start_listener(evt_job: SupervisorJob):
-        if evt_job.uuid == job.uuid:
-            job_started.set()
+        nonlocal started
+        started = started or evt_job.uuid == job.uuid
 
     async def end_listener(evt_job: SupervisorJob):
-        if evt_job.uuid == job.uuid:
-            job_ended.set()
+        nonlocal ended
+        ended = ended or evt_job.uuid == job.uuid
 
-    async with time_machine.travel(dt):
-        job, _ = await test.job_scheduler()
+    coresys.bus.register_event(BusEvent.SUPERVISOR_JOB_START, start_listener)
+    coresys.bus.register_event(BusEvent.SUPERVISOR_JOB_END, end_listener)
 
-        coresys.bus.register_event(BusEvent.SUPERVISOR_JOB_START, start_listener)
-        coresys.bus.register_event(BusEvent.SUPERVISOR_JOB_END, end_listener)
-
-    # Advance time to exactly when job should start and wait for completion
-    async with time_machine.travel(dt + timedelta(seconds=0.1)):
-        await asyncio.wait_for(
-            asyncio.gather(job_started.wait(), job_ended.wait()), timeout=1.0
-        )
+    await asyncio.sleep(0.2)
 
+    assert started
+    assert ended
     assert job.done
     assert job.name == "test_job_scheduled_at_job_task"
     assert job.stage == "work"