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# How to Calculate 90 Days from a Specific Date in Excel

While working in Excel, we often face a situation when we need to calculate a date that is exactly 90 days away from a specific date. If you are wondering how we can do that you have come to the right place. In this article, I will show how to calculate 90 days from a specific date in Excel.

## 2 Useful Methods to Calculate 90 Days from a Specific Date in Excel

In this section, we will demonstrate 2 effective methods to calculate 90 days from a specific date in Excel. To illustrate, I have taken a dataset where we have some dates in a column. In another column, we will try to calculate the date which is 90 days away from the date on the left column. Let’s look at the first method of how we can accomplish our goal.

### 1. Application of SUM Function to Calculate 90 days from a Specific Date in Excel

In the first method, we will utilize the SUM function to calculate the date after 90 days. The SUM function will just sum 90 with the specific date provided in the column. To know how to apply the function, follow the steps below.

Steps:

• First, write down the following formula in cell D5 and press Enter. You will have the result like this.
`=SUM(B5:C5)` • Consequently, we can see from the result that, after 90 days of 10 February 2022, the date will be 11 May 2022.
• Now, use the Fill Handle to autofill the rest of the cells. Our final result will be like this. • As we can see from the figure, each calculated dates are exactly 90 days away from the specified dates in the left column.

### 2. Calculation of 90 days from a Specific Date in Excel by Using the Arithmetic Operator(+)

Instead of using the SUM function, we can use the mathematical operator (+) for adding 90 with the given date. To know more, follow the steps below.

Steps:

• Firstly, write down the following formula in cell D5 and press Enter. Consequently, you will have a similar result to method 1.
`=B5+C5` • After that, we will use the Fill Handle to auto-fill the rest of the cells to get our final result. ## How to Calculate the Date 90 Days Before or After

Sometimes we may need to calculate a date that is either 90 days after or before a specified date. In this section, I will discuss how we can calculate the date 90 days before or after a particular date. To do that, follow the steps below.

Steps:

• In the previous method, I added 90 with the given date to calculate the date after 90 days with the use of the following formula.
`=B5+C5`
• After that, we auto-fill the rest of the cell to get dates after 90 days. • Similarly, we will now subtract 90 to get the date before 90 days by using the following formula.
`=B5-C5` • Now, if you autofill the rest of the cells using the Fill Handle then you will get the complete result. • If we need to calculate the date that is 90 days after today, we can use the TODAY() function to do this.
`=TODAY()+90` • As the day the article was written was 16-11-22, hence the date after 90 days will be 14-02-23. As TODAY is a dynamic function, so it will always update the date when any change occurs.

## How to Calculate 90 Workdays in Excel

On many occasions, we need to calculate a date that is not 90 days after a particular date but rather after 90 official days. It is usually the case when dealing with official datelines that exclude public holidays and weekends. Hence, in this case, we need to use a special function (the WORKDAY function). To illustrate, I have taken a list of dates and on the right column, we will calculate the dates following 90 workdays. To do that, follow the steps below.

Steps:

• Firstly, write down the formula in cell C5 and click You will have the following result,
`=WORKDAY(B5,90)` • If we compare the result with the previous one, we will notice that in earlier cases when only workdays were not counted, the result was 11 May-22, not 16-Jun-22.
• Now, use the Fill Handler to auto-fill the rest of the cells. ## Things to Remember

• If your result is not showing in the proper date format, you have to change the format of the cells to your desired date format.

## Conclusion  