calculateCellforDate.js

let timeOfJustNow = new Date();
let dayInMonth = timeOfJustNow.getDate();
let monthInYear = timeOfJustNow.getMonth();
  
  
// it's only these 3 next lines you should upadet to match your requrements
  
let sheetName = 'Ark 8'; // put the name of your tab in your sheet
let startingColumnChar = 'B'; // set your coumn character for January
let startingRowNbr = 2;       // set your starting row for the first day in month
  
// calulating the column, based on monthNumber
let column = String.fromCharCode( startingColumnChar.charCodeAt(0) + monthInYear);
  
let calulatedCellReference = sheetName + "!"+ column + (startingRowNbr + dayInMonth-1);
  
return calulatedCellReference;