code: function makeDateFromStringAndArray(config) {
          var tempConfig,
              bestMoment,
  
              scoreToBeat,
              i,
              currentScore;
  
          if (config._f.length === 0) {
              config._pf.invalidFormat = true;
              config._d = new Date(NaN);
              return;
          }
  
          for (i = 0; i < config._f.length; i++) {
              currentScore = 0;
              tempConfig = extend({}, config);
              tempConfig._pf = defaultParsingFlags();
              tempConfig._f = config._f[i];
              makeDateFromStringAndFormat(tempConfig);
  
              if (!isValid(tempConfig)) {
                  continue;
              }
  
              // if there is any input that was not parsed add a penalty for that format
              currentScore += tempConfig._pf.charsLeftOver;
  
              //or tokens
              currentScore += tempConfig._pf.unusedTokens.length * 10;
  
              tempConfig._pf.score = currentScore;
  
              if (scoreToBeat == null || currentScore < scoreToBeat) {
                  scoreToBeat = currentScore;
                  bestMoment = tempConfig;
              }
          }
  
          extend(config, bestMoment || tempConfig);
      }
docs: date from string and array of format strings