def strftime(self, date_format: str) -> T_DataArray:
        """
        Return an array of formatted strings specified by date_format, which
        supports the same string format as the python standard library. Details
        of the string format can be found in `python string format doc
        <https://docs.python.org/3/library/datetime.html#strftime-strptime-behavior>`__

        Parameters
        ----------
        date_format : str
            date format string (e.g. "%Y-%m-%d")

        Returns
        -------
        formatted strings : same type as values
            Array-like of strings formatted for each element in values

        Examples
        --------
        >>> import datetime
        >>> rng = xr.Dataset({"time": datetime.datetime(2000, 1, 1)})
        >>> rng["time"].dt.strftime("%B %d, %Y, %r")
        <xarray.DataArray 'strftime' ()> Size: 8B
        array('January 01, 2000, 12:00:00 AM', dtype=object)
        """
        obj_type = type(self._obj)

        result = _strftime(self._obj.data, date_format)

        return obj_type(
            result, name="strftime", coords=self._obj.coords, dims=self._obj.dims
        )

        Return an array of formatted strings specified by date_format, which
        supports the same string format as the python standard library. Details
        of the string format can be found in `python string format doc
        <https://docs.python.org/3/library/datetime.html#strftime-strptime-behavior>`__

        Parameters
        ----------
        date_format : str
            date format string (e.g. "%Y-%m-%d")

        Returns
        -------
        formatted strings : same type as values
            Array-like of strings formatted for each element in values

        Examples
        --------
        >>> import datetime
        >>> rng = xr.Dataset({"time": datetime.datetime(2000, 1, 1)})
        >>> rng["time"].dt.strftime("%B %d, %Y, %r")
        <xarray.DataArray 'strftime' ()> Size: 8B
        array('January 01, 2000, 12:00:00 AM', dtype=object)
        
xarray/core/accessor_dt.py