code: function () {
                var ambiguity_list = AMBIGUITIES[timezone_name],
                    length = ambiguity_list.length,
                    i = 0,
                    tz = ambiguity_list[0];
  
                for (; i < length; i += 1) {
                    tz = ambiguity_list[i];
  
                    if (jstz.date_is_dst(jstz.dst_start_for(tz))) {
                        timezone_name = tz;
                        return;
                    }
                }
            }
docs: The keys in this object are timezones that we know may be ambiguous after
  a preliminary scan through the olson_tz object.
  
  The array of timezones to compare must be in the order that daylight savings
  starts for the regions.