code: def ut1(self, year=None, month=1, day=1, hour=0, minute=0, second=0.0,
              jd=None):
          
          if jd is not None:
              ut1 = jd
          else:
              ut1 = julian_date(
                  _to_array(year), _to_array(month), _to_array(day),
                  _to_array(hour), _to_array(minute), _to_array(second),
              )
          return self.ut1_jd(ut1)
docs: Build a `Time` from a UT1 calendar date.
  
          Supply the Universal Time (UT1) as a proleptic Gregorian
          calendar date:
  
          >>> t = ts.ut1(2014, 1, 18, 1, 35, 37.5)
          >>> t.ut1
          2456675.56640625