Count working days between two dates
Date arithmetic that respects weekends — the difference between a calendar and a delivery promise.
The data
| Row number | A | B | C |
|---|---|---|---|
| 1 | Task | Start | End |
| 2 | Discovery | 2026-03-02 | 2026-03-13 |
| 3 | Build | 2026-03-16 | 2026-04-03 |
| 4 | QA | 2026-04-06 | 2026-04-10 |
Your task
Put a formula in D2 that counts the WORKING days between the start and end dates in row 2, weekends excluded.
Your formula goes in D2
The checker compares your formula against the accepted answers — it does not run it. The expected result is shown with the solution so you can verify it in your own spreadsheet.
Why this is the right formula
NETWORKDAYS counts both endpoints and skips weekends, so 2 to 13 March is 10 working days rather than the 11 calendar days a subtraction gives. In real use you would add a third argument pointing at a list of public holidays — without it, a deadline can land on Christmas Day and the formula will not object.
Try next
Free to use, share and republish — including commercially. Attribution isn't required, but it's what keeps these free to make, and there's one ready to paste below.
Questions
Does this actually run my formula?
No, and it is worth being clear about that. The checker normalises what you type — case, spaces, the semicolon-or-comma separator, dollar-sign anchors — and compares it against every formula that solves the task. The expected result is shown so you can verify it independently in your own spreadsheet.
My formula is different but correct. Will it be marked wrong?
It should not be: each exercise accepts the genuinely different approaches, not one blessed answer. If you find a correct formula that is rejected, the feedback button sends it to us with the page attached.
Do I need an account?
No. There is no signup, no progress tracking and nothing stored — everything happens in your browser.