In Excel, calculating dates is a crucial skill that can be utilized for various purposes such as project management, financial analysis, or deadline tracking. Here’s a detailed guide on how to calculate 90 days before today using Excel.

Key Insights:

• Employ the TODAY() function in Excel to instantly retrieve the current date and ensure your data remains up-to-date.
• Utilize the formula =TODAY()-90 to quickly subtract 90 days from the current date, providing accurate historical data.
• Leverage the EDATE() function for more intricate date calculations involving months.
• Properly format cells to display dates by choosing the "Date" category in the "Format Cells" menu.
• Use conditional formatting with formulas like =B2>TODAY()-90 to visually highlight critical dates for time-sensitive tasks.

Exploring Time with Excel’s Date Functions

The Power of TODAY() and EDATE()

In Excel, you can manipulate time using various functions. The TODAY() function is essential for instantly obtaining the current date, ensuring your data is always current.

When combined with the EDATE function, you have a powerful tool for forecasting. For instance, the formula =EDATE(TODAY(),3) allows you to project three months into the future, ideal for financial planning and anticipating upcoming events.

Rewinding Time: Calculating 90 Days Before Today

If you need to look back in time, the formula =TODAY()-90 is your solution. This simple formula in Excel will show you the date 90 days prior to today, perfect for retrospective analysis, checking compliance deadlines, or reminiscing about past dates.

Excel handles the complexities of different month lengths and leap years effortlessly, ensuring your calculations are always accurate.

Using the EDATE Function for Complex Scenarios

For calculations involving months, the EDATE function is invaluable. To subtract three months from today, use the formula:

=EDATE(TODAY(), -3)

Example: If today is August 4, 2024, the formula =EDATE(TODAY(), -3) will yield May 4, 2024.

Advanced Techniques and Tips

Formatting Dates in Excel

To ensure dates are displayed correctly, follow these steps:

STEP 1: Right-click the cell containing the formula and select "Format Cells."

STEP 2: Choose the "Date" category.

STEP 3: Select the preferred date format and click "OK."

The date will now be displayed in the chosen format.

Visual Indicators: Highlighting Dates Meeting Criteria

Transform your Excel sheet into a dynamic dashboard by using conditional formatting to highlight important dates. To emphasize dates within 90 days, select the cells, go to Conditional Formatting, and set a rule with the formula =B2>TODAY()-90.

This visual cue will make time-sensitive tasks stand out, ensuring they are not overlooked.

Navigating Business Days Calculation Challenges

Defining Business Days: Excluding Weekends and Holidays

In a business context, weekends and holidays are not considered working days. Use the formula =WORKDAY(TODAY(),-90,holidays_range) to calculate 90 business days before today, excluding weekends and specified holidays.

This approach ensures your calculations align with the actual working calendar, facilitating precise planning and deadline management.

Frequently Asked Questions

How to Calculate 90 Days Prior to a Date in Excel?

To calculate 90 days before a specific date, use the formula =A1-90, where A1 is the cell with the start date. This will show you the date 90 days prior to the date in A1, providing the historical context you need.

How Can I Calculate Business Days Instead of Calendar Days?

To calculate business days, use the WORKDAY function: =WORKDAY(A1, -90, holidays_range), where A1 is the end date, -90 represents the number of business days you want to go back, and ‘holidays_range’ is a list of holidays to exclude.

What If I Need to Calculate 90 Business Days From a Certain Date?

To calculate 90 business days from a specific date, use =WORKDAY(A1, 90, holidays_range), where A1 is the starting date, 90 is the number of business days, and ‘holidays_range’ is an optional list of holidays to exclude.

Are There Any Special Excel Add-ins to Simplify These Calculations?

Yes, there are Excel add-ins like Ablebits Date & Time Wizard that simplify date calculations, offering a user-friendly interface for complex date operations within your Excel workspace.

How do I Conditional Format in Excel for 90 Days?

To conditionally format dates within 90 days, select the date cells, go to ‘Conditional Formatting’ on the Home tab, create a new rule, and use the formula =AND(A1<=TODAY()+90) to highlight dates up to and including 90 days from today, emphasizing upcoming time-sensitive tasks.

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