If you want to calculate how much time is left until a certain expiry date, you can use the DATEDIF function. This function returns the difference between two dates in terms of days, months, or years.

The EOMONTH function in Microsoft Excel returns the last day of a month in the past, the current month, or a month in the ...

That's why a framework, not a rule, is a better way to calculate the amount of money you'll need in retirement. Here's how to do it. Image source: Getty Images.

In this step, we will calculate an exponent using the difference between the two numbers from step one as the base, raised to the power of the time difference divided into one.