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let timeOfJustNow = new Date();
let dayInMonth = timeOfJustNow.getDate();
let monthInYear = timeOfJustNow.getMonth()+1;


// 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 = 'D'; // 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( columnChar.charAt(columnChar) + monthInYear);

let calulatedCellReference = sheet + "!"+ column + (startingRowNbr + dayInMonth);

return cellNbr;