This Excel tutorial explains how to use Excel Date Function. You may also want to read: Excel first date of month and last date of month Excel Date Function Excel Date function is used to transform year, month, day into Date Serial, a numeric value that represents the Date. Why do you need Excel Date Function? Date is being treated specially in Excel. The format you see in Excel worksheet such as dd/mm/yyyy is only a displayed formatting, the underlying value of a Date is a numeric v...