Function Problems

How to Combine DATEDIF and IF Formulas in Excel

Maira Mehtab Sep 20, 2026 868 views

Question details

The user wants to combine a DATEDIF formula to calculate the number of weeks between two dates and an IF formula to return a specific result when the calculated weeks fall between a designated lower and upper limit.

Product: Excel
Device & OS: not provided
Scenario: Calculating the weekly difference between a start and end date, then conditionally outputting a value if that difference fits within predefined numerical ranges.
Observed behavior: Requires a nested formula structure utilizing IF, AND, and DATEDIF to simultaneously evaluate date differences against numerical limits.

Before you start

Ensure your start date is earlier than your end date to avoid #NUM! errors with the DATEDIF function, and verify that your limit cells contain valid numeric values.

Solution 1Recommended

Simplify with the LET Function (Microsoft 365 & Office 2021)

If you are using a newer version of Excel, use the LET function to calculate the DATEDIF once, making the formula shorter, more readable, and highly efficient.

The LET function allows you to assign a name to a calculation result. By calculating the DATEDIF once and naming it 'dif', you avoid calculating the exact same date difference twice inside your AND statement.

Select the target cell

Click on the cell where you want the conditional result to appear.

Enter the LET formula

Type the following formula: =LET(dif, DATEDIF(E3, $B$1, "d")/7, IF(AND(dif>=$A$3, dif<=$B$3), $C$3, ""))

Apply the calculation

Press Enter. The formula calculates the weeks, assigns it to the variable 'dif', and checks if 'dif' is between the limits in A3 and B3.

Efficiency Boost: Using LET reduces redundant calculations, which is highly beneficial for the performance of large spreadsheets.

Solution 2

Use Nested IF, AND, and DATEDIF Formulas (All Excel Versions)

This standard approach works in all versions of Excel to calculate the week difference and check it against lower and upper limits.

Solution 3

Expand the Formula for Multiple Ranges

Use an extended nested IF statement if you need to evaluate the week difference against multiple sets of range limits consecutively.

Calculate Date Differences Easily in WPS Spreadsheet

WPS Spreadsheet fully supports advanced functions like DATEDIF, IF, AND, and LET. You can seamlessly execute complex conditional date calculations just as you would in Microsoft Excel.

1. Open your workbook: Launch WPS Spreadsheet and open your existing file containing the date data.
2. Select the output cell: Click on the specific cell where you want to display your conditional result.
3. Enter the formula: Type your combined DATEDIF and IF formula directly into the formula bar.
4. Calculate the result: Press Enter to instantly apply the logic and view the calculated weeks.

Fully compatible with Microsoft Excel formulas and the .xlsx format.Supports advanced nested formulas, including DATEDIF and array functions.Lightweight, fast, and completely free to download and use.

microsoft office alternative - wps office

Frequently Asked Questions

Why does my DATEDIF formula return a #NUM! error?

The DATEDIF function will return a #NUM! error if the start date (the first argument) is greater than the end date (the second argument). Always ensure the earlier date is placed first in the formula.

Can I use 'w' to calculate weeks directly in DATEDIF?

No, DATEDIF does not support 'w' as a unit argument. To find the number of weeks, you must use 'd' to calculate the difference in days, and then divide the result by 7.

Is the LET function available in all versions of Excel?

No, the LET function is only available in Microsoft 365 and Excel 2021 or newer. If you are using an older version, you will need to use the standard nested IF method where the DATEDIF calculation is written out multiple times.

How do I make sure empty date cells don't trigger errors?

You can wrap your main formula inside an IF statement that checks for empty cells first, such as =IF(OR(E3="", B1=""), "", [Your Formula]), to prevent calculation errors when dates are missing.

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