Trying to use an Excel Date and Time function, but Excel returns a serial number instead of date; this is because Excel stores dates and times in serial numbers in the backend; for instance, when ...

How to convert time values into decimal values in Excel Internally, Excel stores the time as a decimal value. The quickest way to see that time value is to change the format.

When you type a seven-or-ten-digit phone number into an Excel cell that uses the phone number format, Excel will automatically change the way the number looks so that it appears as a phone number.