# xarray.CFTimeIndex.difference

`CFTimeIndex.``difference`(other, sort=None)

  Return a new Index with elements from the index that are not in other.

  This is the set difference of two Index objects.

  Parameters:

  - other (Index or array-like) –
  - sort (False or None, default None) –

    Whether to sort the resulting index. By default, the values are attempted to be sorted, but any TypeError from incomparable elements is caught by pandas.

    - None : Attempt to sort the result, but catch any TypeErrors from comparing incomparable elements.
    - False : Do not sort the result.

    New in version 0.24.0.

    Changed in version 0.24.1: Changed the default value from `True` to `None` (without change in behaviour).

  Returns: | difference
  Return type: | Index

  Examples

      >>> idx1 = pd.Index([2, 1, 3, 4])
      >>> idx2 = pd.Index([3, 4, 5, 6])
      >>> idx1.difference(idx2)
      Int64Index([1, 2], dtype='int64')
      >>> idx1.difference(idx2, sort=False)
      Int64Index([2, 1], dtype='int64')