Try to type “DATEDIF” in a cell in your worksheet, you won’t find anything listed with this name.

Even if you check help system, there is nothing listed with this name.

But, if you step back to the help system of the Excel 2000, you will find DATEDIF Function documented there.

Well, it’s a mystery that why Microsoft has hidden the DATEDIF Function from functions list.

If you ask me, DATEDIF is the best function to get the difference between two dates.

And, one of its best examples is calculating a person’s age using his date of birth.

Now the question is:

If this function is not there, how we can use it in all the new versions of Excel?

And the answer is:

We can use it like we use all the Excel functions. The only difference is when you try to insert it Excel will not show it’s syntax arguments.

So today, in this post, I’d like to share with you all the details about DATEDIF function.

Let’s get started.

DATEDIF(Date1,Date2,Interval)

Date1: The date from where you want to start the calculation of your interval. In simple words, it is the start date of the interval.

Date2: The date to which you want to calculate the interval. In simple words, it is the end date of your interval.

Interval: It represents the unit of the time, which will return from the function. We have six specific text strings to represent different time units.

You have 6 different types of intervals to calculate the difference between two dates.

It will return the complete years between the start date and the end date ignoring the months and days which are in excess.

In the above example, you have calculated the interval between two dates by using “y”.

If you actually check, the difference between these two dates is more than 25 years (37 days more).

But, it has only returned the completed years, that is 25.

It will return the number of complete months between the start date and end date by ignoring the excess days.

It has returned 301 months in the result which are the total completed months ignoring excess 7 days.

It will return the total days between the start date and end date. As days are the smallest units between two dates, that’s why you will get total days here.

In the above example, we have total days between the start and end date.

It will return numbers of the completed months over the completed years.

In simple words, if you have the total interval of 25 years 1 month and 7 days between two dates, it will return 1 month in the result.

In the above example, we have calculated the number of complete months left after competing years between the start date and end date.

It will return the number of the days over the complete years.

In the simple words, if you have a total interval of 25 years and 37 days between two dates, it will return 37 days in the result.

In the above example, you have calculated the number of days left after the complete years between the start date and end date.

It will return the excess number of days over the complete months.

In simple words, if you have the total interval of 301 months and 7 days between two dates, it will return 7 days in the result.

In the above example, we have calculated the number of days left after the complete months between the start date and end date.

- It will ignore the time in date.
- End date (Date2) should be greater than the start date (Date1).

Download this sample file from here to learn more.