docs: function (dt, format) {
              var ret;
              if (this.convertTwoDigitYears) {
                  ret = date.parse(dt, this.TWO_YEAR_DATE_FORMAT);
              }
              if (!ret) {
                  ret = date.parse(dt, format || this.dateFormat);
              }
              if (!ret) {
                  throw new PatioError("Unable to convert date: " + dt);
              }
              return ret;
          }