'Find UT1 - UTC differences by interpolating in IERS Table.
Parameters
iers_table : ``astropy.utils.iers.IERS`` table, optional
Table containing UT1-UTC differences from IERS Bulletins A
and/or B.  If `None`, use default version (see
``astropy.utils.iers``)
return_status : bool
Whether to return status values.  If `False` (default), iers
raises `IndexError` if any time is out of the range
covered by the IERS table.
Returns
ut1_utc : float or float array
UT1-UTC, interpolated in IERS Table
status : int or int array
Status values (if ``return_status=`True```)::
``astropy.utils.iers.FROM_IERS_B``
``astropy.utils.iers.FROM_IERS_A``
``astropy.utils.iers.FROM_IERS_A_PREDICTION``
``astropy.utils.iers.TIME_BEFORE_IERS_RANGE``
``astropy.utils.iers.TIME_BEYOND_IERS_RANGE``
Notes
In normal usage, UT1-UTC differences are calculated automatically
on the first instance ut1 is needed.
Examples
To check in code whether any times are before the IERS table range::
>>> from astropy.utils.iers import TIME_BEFORE_IERS_RANGE
>>> t = Time([\'1961-01-01\', \'2000-01-01\'], scale=\'utc\')
>>> delta, status = t.get_delta_ut1_utc(return_status=True)
>>> status == TIME_BEFORE_IERS_RANGE
array([ True, False], dtype=bool)'

def get_delta_ut1_utc(self, iers_table=None, return_status=False):

    if (iers_table is None):
        from ..utils.iers import IERS
        iers_table = IERS.open()
    return iers_table.ut1_utc(self.utc, return_status=return_status)
