DATE / Project Manager

Determine Project Deadline from Start Date

I need to find the exact calendar date for a project deadline that is 45 working days from the start date.

formula.xlsx

=WORKDAY.INTL(A2,B2)

How it works: While the `DATE` function constructs a date from year, month, and day components, the problem of calculating a deadline based on 'working days' requires a more specialized function. `WORKDAY.INTL` is specifically designed for this purpose. It calculates a future or past date by adding or subtracting a specified number of working days, automatically excluding weekends (Saturdays and Sundays by default) and optionally custom holidays. This ensures that project deadlines accurately reflect business days, providing a reliable target date for Project Managers.

Data Setup

Start Date	Working Days	Deadline Date
2023-10-26	45	2023-12-28

Step-by-Step Guide

Enter your project start date (e.g., 2023-10-26) in cell A2.

Enter the number of working days to add (e.g., 45) in cell B2.

In cell C2, enter the formula `=WORKDAY.INTL(A2,B2)`.

Press Enter to see the calculated project deadline date.

If the result appears as a number, format cell C2 as a 'Short Date' to display it correctly.

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