Turn a calculation need and real column layout into a formula you can verify. Fournir: Calculation requirement, Columns or cells, Example rows and expected results. Résultat attendu: A copy-ready formula, explanation, assumptions, and test cases.
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ChatGPTCreate an Excel formula for this requirement:
[requirement]
Workbook layout:
[layout]
Example rows and expected results:
[examples]
Use the stated headers or cell references exactly. Do not invent missing columns. If the requirement is ambiguous, list the ambiguity before proposing a formula. Return:
1. Formula for the first data row
2. Plain-language explanation of each part
3. Assumptions about blanks, errors, dates, text, and regional separators
4. Three test cases with expected results
5. A simpler alternative if one exists
Prefer standard Excel functions and do not use volatile functions unless they are necessary.De l'entrée au résultat
Voyez comment un contexte concret transforme cette recette en résultat utilisable.
Formula for E2
=IF(C2="","",IF(D2="",DATE(2026,6,30)-C2,D2-C2))
How it works The outer IF returns an empty string when C2 has no created date. The inner IF uses 30 June 2026 when D2 is blank; otherwise it subtracts the created date from the closed date. Excel stores dates as serial numbers, so subtraction returns calendar days.
Assumptions C and D contain real Excel dates, not text. A same-day close returns 0. A closed date before creation produces a negative number and should be investigated rather than hidden. The formula uses commas; installations using semicolons must replace the separators.
Tests 1 Jun to 5 Jun → 4; 20 Jun with no close → 10; missing created date → blank. Add a same-day case to confirm that 0 is intended.
Alternative There is no meaningfully simpler standard formula that preserves all three rules.
Real headers and expected results constrain the formula to the actual workbook.
Explicit edge cases expose blank and type-handling mistakes before the formula is filled down.
Does the formula reference only supplied cells or headers?
Do the test cases cover blanks and a boundary value?
Does the result match a manual calculation for at least two rows?
Utilisez-la en toute confiance
Des réponses pratiques sur le bon moment pour utiliser cette recette, ce qu’il faut fournir et les cas où une vérification humaine reste nécessaire.
For “Generate an Excel formula from a requirement,” prepare Calculation requirement, Columns or cells, and Example rows and expected results. Replace placeholders only with information you can verify. If a detail is unknown, preserve that uncertainty explicitly instead of asking the model to infer it.
The result is not ready if it does not yet deliver the stated outcome—A copy-ready formula, explanation, assumptions, and test cases—from the supplied evidence, or if it relies on unresolved assumptions, missing approvals, or invented details. Use the checks as release gates: revise the source inputs or assign a named, authorized reviewer instead of polishing an unsupported output.
The published test record for “Generate an Excel formula from a requirement” lists ChatGPT as of 2026-08-28. This confirms recorded runs, not guaranteed compatibility or identical results in later product versions. For another tool or version, keep every constraint visible and repeat the result checks before use.
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