BUG: Supress read_json Spurious to_datetime FutureWarning

pandas/io/json/_json.py

@@ -1199,7 +1199,7 @@ def _convert_axes(self) -> None:
                 name=axis_name,
                 data=ser,
                 use_dtypes=False,
-                convert_dates=True,
+                convert_dates=self.convert_dates,
                 is_axis=True,
             )
             if result:
@@ -1346,6 +1346,12 @@ def _try_convert_to_date(self, data: Series) -> tuple[Series, bool]:
                         "zones will raise an error",
                         category=FutureWarning,
                     )
+                    warnings.filterwarnings(
+                        "ignore",
+                        "The behavior of 'to_datetime' with 'unit' "
+                        "when parsing strings is deprecated.*",
+                        category=FutureWarning,
+                    )
                     new_data = to_datetime(new_data, errors="raise", unit=date_unit)
             except (ValueError, OverflowError, TypeError):
                 continue

pandas/tests/io/json/test_pandas.py

@@ -2186,3 +2186,9 @@ def test_read_json_lines_rangeindex():
     result = read_json(StringIO(data), lines=True).index
     expected = RangeIndex(2)
     tm.assert_index_equal(result, expected, exact=True)
+
+
+def test_read_json_to_datetime_futurewarning_supress():
+    data = '{"A":{"0":"X","Y":"Y"}}'
+    with tm.assert_produces_warning(None):
+        read_json(StringIO(data))