code: def test_datetime_ordered(self):
      # Test if datetime64 index and ordered
      result = self.data.ta.datetime_ordered
      self.assertTrue(result)
  
      # Test if not ordered
      original = self.data.copy()
      reversal = original.ta.reverse
      result = reversal.ta.datetime_ordered
      self.assertFalse(result)
  
      # Test a non-datetime64 index
      original = self.data.copy()
      original.reset_index(inplace=True)
      result = original.ta.datetime_ordered
      self.assertFalse(result)
  
imports: from .config import error_analysis, sample_data, CORRELATION, CORRELATION_THRESHOLD, VERBOSE
  from .context import pandas_ta
  from unittest import TestCase, skip
  import pandas.testing
  from pandas import DataFrame, Series
  import talib
label_desc: Use image node_id 5 for calling the TestMomentum obj's underlying member method code with example usage: obj.test_datetime_ordered() without return types