docs: def jd_to_datetime(jd):
      """
      Convert a Julian Day to an `jdutil.datetime` object.
  
      Parameters
      ----------
      jd : float
          Julian day.
  
      Returns
      -------
      dt : `jdutil.datetime` object
          `jdutil.datetime` equivalent of Julian day.
  
      Examples
      --------
      >>> jd_to_datetime(2446113.75)
      datetime(1985, 2, 17, 6, 0)
  
      """
      year, month, day = jd_to_date(jd)
  
      frac_days,day = math.modf(day)
      day = int(day)
  
      hour,min,sec,micro = days_to_hmsm(frac_days)
  
      return datetime(year,month,day,hour,min,sec,micro)