code: def to_jd(year, week, day):
      '''Return Julian day count of given ISO year, week, and day'''
      return day + n_weeks(SUN, gregorian.to_jd(year - 1, 12, 28), weekf to_jd(year, week, day):
      '''Return Julian day count of given ISO year, week, and day'''
      return day + n_weeks(SUN, gregorian.to_jd(year - 1, 12, 28), week)
docs: Return Julian day count of given ISO year, week, and day