text: function solve(year, month, day){
      let currDate = new Date(year, month-1, day);
      let oneDay = 24*60*60*1000;
      let nextDate = new Date(currDate.getTime() + oneDay);
      console.log(`${nextDate.getFullYear()}-${nextDate.getMonth()+1}-${nextDate.getDate()}`);
  }
  
  solve(2016, 9, 30);
  