This Excel tutorial shows how to calculate age in Excel using DateDif function with changing time interval input variables to get the desired output. Excel DATEDIF function is used to calculate difference between two dates and express time difference in forms of days, months or years. Since DATEDIF Excel function is an undocumented function, Excel users sometimes use workarounds to calculate age of a person in terms of years, for example.
But Excel DateDif date difference function provides a direct use to express time period between two dates in desired time intervals like years, months or days. If you use minus (-) between two dates in an Excel formula, it returns the date difference only in forms of days. Although calculating time period between two dates is a frequent task and has been implemented using build-in functions in many development languages and programming scripts, Microsoft Excel did not have a date difference function listed in help documentation.

It is interesting that DateDif function in Excel is kept undocumented and away from the eyes of Microsoft Excel users. If your requirement is to express date difference in forms of a combination of different time intervals like 25 years 3 months and 12 days, then you need a more complex formula. This complex date difference formula will use a number of Excel DateDif function to form the desired output. Let's assume that you want to calculate the age of a person who was born at 2nd of June in 1995.
Besides the time intervals "y", "m" and "d" we have additional time intervals that can be used with Excel DATEDIFF function. If you are not sure A2 is small date where else A1 cell has bigger date, you can prevent Microsoft Excel to display error using ERRORIF function for error handling.

If you come across this problem then we can quickly fix by changing the format of the cell to numeric rather than what it is currently displaying which is the result in a date format. Converting julian dates gregorian calendar dates, Provides formula and examples to convert between julian and gregorian calendar dates. Calendar date - wikipedia, free encyclopedia, A calendar date reference day represented calendar system.

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