code: def test_valid(self) -> None:
      prop = bcpd.Date()
      assert prop.is_valid(datetime.date(2020, 1, 11))
      assert prop.is_valid("2020-01-10")
  
imports: from __future__ import annotations
  import pytest
  import datetime
  import numpy
  import pandas
  from bokeh.util.serialization import convert_date_to_datetime
  from tests.support.util.api import verify_all
  from _util_property import _TestHasProps, _TestModel
  import bokeh.core.property.datetime
label_desc: Use image node_id 1 for calling the Test_Date obj's underlying member method code with example usage: obj.test_valid() without return types