diff --git a/apps/api/app/api/v1/routes/jobs.py b/apps/api/app/api/v1/routes/jobs.py
index 31bc5268b..d7c6972a2 100644
--- a/apps/api/app/api/v1/routes/jobs.py
+++ b/apps/api/app/api/v1/routes/jobs.py
@@ -6,7 +6,7 @@
 
 import os
 import uuid
-from datetime import datetime, timezone
+from datetime import datetime, timedelta, timezone
 from typing import Any, Dict, Literal, Optional, cast
 from urllib.parse import urlparse
 
@@ -53,6 +53,7 @@
     StandardErrorObject,
 )
 from shared.services.storage.file_upload_service import FileUploadService
+from shared.utils.utc_now import utc_now_naive
 from shared.utils.url_security import (
     validate_http_url_and_resolve_ip_async,
 )
@@ -268,6 +269,15 @@ def ensure_utc(dt: Optional[datetime]) -> Optional[datetime]:
     return dt.replace(tzinfo=timezone.utc)
 
 
+def normalize_naive_utc_filter_datetime(dt: Optional[datetime]) -> Optional[datetime]:
+    """Convert a query datetime into the naive UTC form used by database columns."""
+    if dt is None:
+        return None
+    if dt.tzinfo is None or dt.utcoffset() is None:
+        return dt
+    return dt.astimezone(timezone.utc).replace(tzinfo=None)
+
+
 def require_utc(dt: Optional[datetime], *, field_name: str) -> datetime:
     """Normalize a required datetime to UTC."""
     normalized_dt = ensure_utc(dt)
@@ -678,13 +688,18 @@ async def list_jobs(
                 user_message="recent_days only supports 1, 7, or 30",
                 violations=[{"field": "recent_days", "description": "Invalid value"}],
             )
-        created_after = None
+        created_after: Optional[datetime] = None
         if recent_days:
-            from datetime import datetime, timedelta
+            created_after = utc_now_naive() - timedelta(days=recent_days)
 
-            created_after = datetime.now() - timedelta(days=recent_days)
+        normalized_start_time = normalize_naive_utc_filter_datetime(start_time)
+        normalized_end_time = normalize_naive_utc_filter_datetime(end_time)
 
-        if start_time and end_time and start_time > end_time:
+        if (
+            normalized_start_time
+            and normalized_end_time
+            and normalized_start_time > normalized_end_time
+        ):
             raise ValidationException(
                 user_message="start_time cannot be later than end_time",
                 violations=[
@@ -692,9 +707,9 @@ async def list_jobs(
                 ],
             )
         # start_time / end_time take priority over recent_days.
-        if start_time:
-            created_after = start_time
-        created_before = end_time
+        if normalized_start_time:
+            created_after = normalized_start_time
+        created_before = normalized_end_time
 
         # Count matching rows.
         total_count = await job_repo.count_jobs_by_user(
@@ -752,10 +767,8 @@ async def list_jobs(
 
                 # Compute result_url_expires_at when a download URL was issued.
                 if result_url:
-                    from datetime import datetime, timedelta
-
                     expires_in = int(result_url_info.get("expires_in", 3600))
-                    result_url_expires_at = datetime.now() + timedelta(
+                    result_url_expires_at = utc_now_naive() + timedelta(
                         seconds=expires_in
                     )
 
diff --git a/apps/api/tests/contract/test_job_read_contract.py b/apps/api/tests/contract/test_job_read_contract.py
index 58d07e048..136d20f89 100644
--- a/apps/api/tests/contract/test_job_read_contract.py
+++ b/apps/api/tests/contract/test_job_read_contract.py
@@ -1,5 +1,6 @@
 from collections.abc import Callable
 from contextlib import AbstractAsyncContextManager
+from datetime import datetime, timedelta, timezone
 from typing import cast
 from uuid import uuid4
 
@@ -67,6 +68,34 @@ async def test_should_list_created_jobs_for_the_authenticated_developer(
     assert job["credits_spent"] == 0.0
 
 
+@pytest.mark.asyncio
+async def test_should_list_jobs_when_date_filters_use_iso_utc_timezone(
+    developer_api_client_factory: Callable[
+        [], AbstractAsyncContextManager[AsyncClient]
+    ],
+) -> None:
+    start_time = datetime.now(timezone.utc) - timedelta(days=1)
+    end_time = datetime.now(timezone.utc) + timedelta(days=1)
+    query_params = {
+        "start_time": start_time.isoformat().replace("+00:00", "Z"),
+        "end_time": end_time.isoformat().replace("+00:00", "Z"),
+    }
+
+    async with developer_api_client_factory() as api_client:
+        created_job = await _create_waiting_file_job(api_client)
+
+        response = await api_client.get("/api/v1/jobs/page", params=query_params)
+
+    assert response.status_code == 200
+
+    response_json = cast(dict[str, object], response.json())
+    jobs = cast(list[dict[str, object]], response_json["jobs"])
+
+    assert response_json["total"] == 1
+    assert len(jobs) == 1
+    assert jobs[0]["job_id"] == created_job["job_id"]
+
+
 @pytest.mark.asyncio
 async def test_should_return_job_details_for_an_existing_waiting_file_job(
     developer_api_client_factory: Callable[