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And then, concatenate the 3 DATEDIF functions in a single formula, separate the numbers returned by each function with commas, and define what each number means.

Assuming the date of birth is in cell B2, the complete formula goes as follows: This age formula may come in very handy, say, for a doctor to display the exact age of patients, or for a personnel officer to know the exact age of all employees: For more formula examples such as calculating age at a particular date or in a certain year, please check out the following tutorial: How to calculate age in Excel - formula examples.

If you already have a list of dates in your Excel worksheet and you want to know which ones are leap years, then incorporate the YEAR function in the formula to extract a year from a date: Where A2 is a cell containing the date.

The results returned by the formula are as follows: Alternatively, you can use the EOMONTH function to return the last day in February, and compare that number with 29: This is another obvious test that hardly requires any explanation.

The following screenshot demonstrates all of the above YEAR formulas in action, all returning 2015 as you might expect :) When you work with date information in Excel, your worksheets usually display full dates, including month, day and year.

However, for major milestones and important events such as product launches or asset acquisitions, you may want to view only the year without re-entering or modifying the original data. In fact, you already know how to use the YEAR function in Excel to convert a date to a year.

I'm going to demonstrate just a couple of formulas, which in my opinion are easiest to understand. Since February has 29 days in leap years, we calculate the number of days in month 2 of a given year and compare it with number 29.

For example: day of March in the year 2015, from which we subtract 1.

Today, we are going to focus on a bigger time unit and talk about calculating years in your Excel worksheets. However, Microsoft does not guarantee correct results when a date is supplied as a text value.The screenshot above demonstrates a bunch of formulas, and you can see a few more examples in the screenshot below.Notice that the YEAR function perfectly understands dates in all possible formats: To convert a given date to year and month, you can use the TEXT function to extract each unit individually, and then concatenate those functions within one formula.Dividing by 365.25 instead of 365 is not impeccable either, for example, when calculating the age of a child who hasn't yet lived through a leap year.Given the above, you'd better save this way of calculating age for normal life, and use one of the following formulas to calculate age from date of birth in Excel.