diff --git a/tests/test_wmts.py b/tests/test_wmts.py
index ecee9de..f5a9b11 100644
--- a/tests/test_wmts.py
+++ b/tests/test_wmts.py
@@ -273,6 +273,10 @@ def test_wmts_gettile(client, get_assets, rio, app):
         },
     )
     assert response.status_code == 200
+    assert (
+        get_assets.call_args.kwargs.get("search_query").get("datetime")
+        == "2023-01-05T00:00:00Z/2023-01-05T23:59:59Z"
+    )
 
     response = app.get(
         "/wmts",
@@ -291,6 +295,10 @@ def test_wmts_gettile(client, get_assets, rio, app):
         },
     )
     assert response.status_code == 200
+    assert (
+        get_assets.call_args.kwargs.get("search_query").get("datetime")
+        == "2023-01-05T00:00:00Z/2023-01-05T23:59:59Z"
+    )
 
 
 @patch("rio_tiler.io.rasterio.rasterio")
diff --git a/titiler/stacapi/factory.py b/titiler/stacapi/factory.py
index d2e436a..ea89f79 100644
--- a/titiler/stacapi/factory.py
+++ b/titiler/stacapi/factory.py
@@ -811,7 +811,7 @@ def get_tile(  # noqa: C901
                 )
 
             ###########################################################
-            # STAC Query parameter provided by the the render extension and QueryParameters
+            # STAC Query parameter provided by the render extension and QueryParameters
             ###########################################################
             query_params = copy(layer.get("render")) or {}
 
@@ -820,7 +820,13 @@ def get_tile(  # noqa: C901
                     req_time,
                     "%Y-%m-%d",
                 ).replace(tzinfo=python_datetime.timezone.utc)
-                end_datetime = start_datetime + python_datetime.timedelta(days=1)
+                end_datetime = (
+                    start_datetime
+                    + python_datetime.timedelta(days=1)
+                    - python_datetime.timedelta(
+                        milliseconds=1
+                    )  # prevent inclusion of following day
+                )
 
                 query_params[
                     "datetime"