code: def test_value_as_datetime_when_set_mixed(self) -> None:
      start = datetime(2017, 8, 9, 0, 0).astimezone(timezone.utc)
      end = datetime(2017, 8, 10, 0, 0).astimezone(timezone.utc)
      s = mws.DateRangeSlider(
          start=start,
          end=end,
          value=(start, convert_datetime_type(end)),
      )
      assert s.value_as_datetime == (start, end)
  
      s = mws.DateRangeSlider(
          start=start,
          end=end,
          value=(convert_datetime_type(start), end),
      )
      assert s.value_as_datetime == (start, end)
  
imports: from __future__ import annotations
  import pytest
  import logging
  from datetime import date, datetime, timezone
  from bokeh.core.properties import UnsetValueError
  from bokeh.core.validation.check import check_integrity, process_validation_issues
  from bokeh.util.logconfig import basicConfig
  from bokeh.util.serialization import convert_date_to_datetime, convert_datetime_type
  import bokeh.models.widgets.sliders
label_desc: Use image node_id 4 for calling the TestDateRangeSlider obj's underlying member method code with example usage: obj.test_value_as_datetime_when_set_mixed() without return types