Excel Formula to Calculate the First Friday of Any Month

Pinpointing shifting weekdays like the first Friday of a month in Excel often leads to tedious manual errors during monthly payroll or project scheduling. While standard calendar lookups or basic date inputs offer a temporary fix, they lack dynamic scalability. Masterfully automating this calculation guarantees schedule precision, saving valuable administrative time. However, this approach carries the stipulation that your inputs must correctly align with Excel's numerical weekday system. For example, targeting the first Friday of May 2024 requires a precise nested logic. Below, we will analyze the exact formula syntax and step-by-step breakdown to streamline your forecasting.

In business, finance, and project management, scheduling often relies on dynamic, relative dates rather than fixed calendar days. Whether you are setting up recurring payroll schedules, organizing monthly team-building events, tracking financial clearing cycles, or planning maintenance windows, finding the "First Friday" of a given month is a common requirement.

Excel offers several ways to solve this problem. Depending on your version of Excel and your familiarity with its functions, you can choose between a classic mathematical approach using legacy date functions or a modern, highly elegant solution using international workday parameters. This comprehensive guide details the best Excel formulas to find the first Friday of any specific month, complete with step-by-step logic, breakdown explanations, and advanced variations.

Setting Up Your Excel Worksheet

To follow along with the formulas in this guide, set up a simple spreadsheet with input cells for the year and the month. This allows your formulas to remain dynamic and reusable.

• Cell A2: The Year (e.g., 2024)
• Cell B2: The Month number (e.g., 11 for November)

Method 1: The Modern & Simple Way (Using WORKDAY.INTL)

If you are using Excel 2010 or newer, the absolute easiest and most elegant way to find the first Friday of a specific month is by using the WORKDAY.INTL function. This function allows you to define custom "weekends" using a string of binary digits, turning Excel's standard date engine into a powerful scheduler.

The Formula

=WORKDAY.INTL(DATE(A2, B2, 1) - 1, 1, "1111011")

How It Works

The WORKDAY.INTL function syntax is: WORKDAY.INTL(start_date, days, [weekend], [holidays]). We can leverage this by treating every day of the week except Friday as a weekend day.

1. DATE(A2, B2, 1) - 1 (The Start Date): First, we construct the first day of our target month using DATE(A2, B2, 1). We then subtract 1 to find the last day of the previous month. For November 2024, this yields October 31, 2024. We start here to ensure that if the 1st of the month is a Friday, the formula catches it.
2. 1 (Days to Advance): We instruct Excel to find the very next "workday" after our start date.
3. "1111011" (The Custom Weekend Mask): This 7-character string represents the seven days of the week starting on Monday. A 1 represents a non-workday (weekend), and a 0 represents a workday.
   • Position 1 (Monday): 1 (Weekend)
   • Position 2 (Tuesday): 1 (Weekend)
   • Position 3 (Wednesday): 1 (Weekend)
   • Position 4 (Thursday): 1 (Weekend)
   • Position 5 (Friday): 0 (Workday)
   • Position 6 (Saturday): 1 (Weekend)
   • Position 7 (Sunday): 1 (Weekend)
   By configuring the mask this way, Excel views Friday as the only valid "workday" of the week.

Combining these elements, the formula goes to the eve of the target month and finds the very next "workday" (which can only be a Friday). It is robust, easy to read, and works flawlessly.

Method 2: The Classic Formula (Using DATE, WEEKDAY, and MOD)

If you require backwards compatibility with older versions of Excel, or if you prefer a purely mathematical solution that does not rely on international workday strings, you can use a combination of DATE, WEEKDAY, and MOD.

The Formula

=DATE(A2, B2, 1) + MOD(6 - WEEKDAY(DATE(A2, B2, 1)), 7)

How It Works

This formula calculates the exact number of days to add to the first of the month to arrive at the first Friday.

1. DATE(A2, B2, 1): Establishes the first day of the target month. Let's use October 2024 as an example. The first of the month is October 1, 2024, which is a Tuesday.
2. WEEKDAY(DATE(A2, B2, 1)): This returns a number from 1 (Sunday) to 7 (Saturday) indicating the day of the week. For Tuesday, October 1, this returns 3.
3. 6 - WEEKDAY(...): We use 6 because Friday is the 6th day of the week in standard Excel indexing (Sunday = 1, Monday = 2... Friday = 6). For our Tuesday example, this results in: 6 - 3 = 3.
4. MOD(..., 7): The MOD function returns the remainder of a division. This step is critical because if the first of the month falls on a Saturday (7), the basic subtraction returns a negative number (6 - 7 = -1). The calculation MOD(-1, 7) evaluates to 6 in Excel, correctly indicating that we must add 6 days to get to the first Friday.
5. Adding to the 1st: Finally, Excel adds the calculated offset to the first of the month. For October 1, 2024 (Tuesday), the formula adds 3 days, landing perfectly on October 4, 2024 (Friday).

Generalizing: Finding the First of Any Weekday

Both methods can be easily adapted to find the first occurrence of any day of the week (Monday through Sunday). Use the reference table below to modify either formula for your specific needs:

Advanced Variation: Finding the Nth Friday of a Month

Once you know how to find the first Friday, you can expand this logic to locate the second, third, or fourth Friday of the month. This is useful for scheduling cycles like "bi-weekly paydays on the 2nd and 4th Friday."

Using WORKDAY.INTL for the Nth Friday

To find the 2nd, 3rd, or 4th Friday of a month, simply change the second argument (the days parameter) in your WORKDAY.INTL formula. For example, to find the 3rd Friday of November 2024:

=WORKDAY.INTL(DATE(A2, B2, 1) - 1, 3, "1111011")

By changing the argument from 1 to 3, you tell Excel to find the 3rd instance of a Friday after the eve of the target month.

Using legacy mathematical formulas for the Nth Friday

With the classic mathematical approach, you can find the Nth occurrence of a weekday by adding multiples of 7 (representing weeks) to your baseline first-Friday formula:

=DATE(A2, B2, 1) + MOD(6 - WEEKDAY(DATE(A2, B2, 1)), 7) + (N - 1) * 7

Where N is the occurrence you want to find. For the 3rd Friday (N = 3), the formula becomes:

=DATE(A2, B2, 1) + MOD(6 - WEEKDAY(DATE(A2, B2, 1)), 7) + 14

Bonus: Finding the Last Friday of a Month

In some payroll and accounting models, operations must take place on the last Friday of the month. This can also be calculated dynamically using the WORKDAY.INTL function by reversing the search direction.

To find the last Friday, construct a formula that starts on the first day of the next month, and steps backward by 1 workday (configured to only find Fridays):

=WORKDAY.INTL(DATE(A2, B2 + 1, 1), -1, "1111011")

Because the second parameter is negative (-1), Excel counts backward in time starting from the first day of the following month, identifying the final Friday of your target month.

Troubleshooting & Formatting Tips

• Why does my cell show a random five-digit number? Excel stores dates as serial numbers (e.g., 45601). If your formula returns a number like 45601 instead of a date, select the cell, go to the Home tab, click the number format dropdown, and select Short Date or Long Date.
• Handling Leap Years: Both formulas automatically handle leap years because the DATE function natively manages year lengths, months, and leap days in the background.
• Dynamic Month Inputs: If you input 13 for the month or 0, Excel will roll the date forward or backward automatically. For consistent results, ensure your month cell (B2) contains integers between 1 and 12.

Conclusion

For most modern users, the WORKDAY.INTL approach is the superior method. It is shorter, easier to read, highly adaptable, and dramatically simplifies the math required to find dynamic days of the week. If you are building spreadsheets that need backward compatibility with Excel 2007 or earlier, stick with the classic DATE, WEEKDAY, and MOD combination to guarantee cross-version compatibility.