code: function(startDay, startTime, index){
        var firstDayPos = this.days.indexOf(this.getCorrectDay(startDay)); //get position of first day
  
        //Black magic
        if(((startTime+index)/this.times.length)%1 === 0 && startTime+index !== 0){
          this.currentDayOffset++;
        }
        return (firstDayPos + this.currentDayOffset) % this.days.length;
      }
docs: /*
  PUBLIC (probably shouldn't be...)
  Helper method to return the correct index for the day of a specified
  column.
  startDay: The first day in the snow forecast.
  startTime: The first time in the snow forecast.
  index: Current index, ranges from 0 to MAX_INDEX_CNT(17).
  
  returns: dayOffset: index of current day for specified column of forecast data.