function d3_time_parseWeekday(date, string, i) {
      d3_time_dayRe.lastIndex = 0;
      var n = d3_time_dayRe.exec(string.substring(i));
      return n ? (date.w = d3_time_dayLookup.get(n[0].toLowerCase()), i + n[0].length) : -1;
    }