EOMONTH
Supported, behaves as documentedCategory: Date and time · Last tested 2026-09-01
Real compatibility results for the EOMONTH function: executed in Excel for the web, Google Sheets and LibreOffice Calc, with desktop Excel behavior from Microsoft’s official documentation (we do not run desktop Excel — Excel for the web is a different application and is executed separately). Syntax and links to that documentation are below.
Support matrix
| Engine | Documented | Live-tested | Verdict |
|---|---|---|---|
| Excel (desktop) | Yes | No — documented only | n/a |
| Excel for the web | — | Yes (recalc, 2026-09-01) | Supported, behaves as documented |
| Google Sheets | Yes | Yes (Drive import, 2026-08-29) | Supported, behaves as documented |
| LibreOffice Calc | Yes | Yes (25.8.7.3, 2026-07-29) | Supported, behaves as documented |
LibreOffice version history
We executed the same test cases under each LibreOffice release to show exactly when EOMONTH’s support changed — not documentation claims, real results.
| LibreOffice version | Verdict | Tested |
|---|---|---|
| 24.2.0.3 | Supported, behaves as documented | 2026-08-29 |
| 24.8.7.2 | Supported, behaves as documented | 2026-08-29 |
| 25.2.0.3 | Supported, behaves as documented | 2026-08-29 |
| 25.8.7.3 | Supported, behaves as documented | 2026-07-29 |
Executed test cases
Excel for the web (executed 2026-09-01 via OneDrive recalculation)
These values come from Excel for the web, not from desktop Excel. They are two different implementations of the calculation engine, and this run measured only the web one: the corpus was uploaded to OneDrive as .xlsx, recalculated by Excel for the web on open, and downloaded again for readback. Excel for the web is a rolling service with no pinnable version, so the run is identified by its date. Where a value here disagrees with the Expected column — which is Microsoft’s documentation of the desktop product — we cannot tell you whether the web engine diverges from the desktop one or the documentation is wrong about both, because we do not run desktop Excel.
| Formula | Description | Result | Expected | Verdict |
|---|---|---|---|---|
| =EOMONTH(DATE(2024,3,15),0) | months=0 returns the end of the SAME month as the given date | 45382 | 45382ProvenanceEnd of March 2024 = 2024-03-31 = serial 45382 |
Matched |
| =EOMONTH(DATE(2024,3,15),1) | Positive months argument moves forward to the end of a future month | 45412 | 45412ProvenanceEnd of April 2024 = 2024-04-30 = serial 45412 |
Matched |
| =EOMONTH(DATE(2024,3,15),-1) | Negative months argument moves backward to the end of a past month | 45351 | 45351ProvenanceEnd of February 2024 (a leap year) = 2024-02-29 = serial 45351 |
Matched |
| =EOMONTH(DATE(2024,12,15),1) | Positive offset that also crosses a year boundary | 45688 | 45688ProvenanceEnd of January 2025 = 2025-01-31 = serial 45688 |
Matched |
Google Sheets (executed 2026-08-29 via Drive import)
Google Sheets is a rolling service with no pinnable version, so this run is identified by its date. The corpus was imported to Drive as .xlsx, recalculated by Sheets, and exported back for readback.
| Formula | Description | Result | Expected | Verdict |
|---|---|---|---|---|
| =EOMONTH(DATE(2024,3,15),0) | months=0 returns the end of the SAME month as the given date | 45382.0 | 45382ProvenanceEnd of March 2024 = 2024-03-31 = serial 45382 |
Matched |
| =EOMONTH(DATE(2024,3,15),1) | Positive months argument moves forward to the end of a future month | 45412.0 | 45412ProvenanceEnd of April 2024 = 2024-04-30 = serial 45412 |
Matched |
| =EOMONTH(DATE(2024,3,15),-1) | Negative months argument moves backward to the end of a past month | 45351.0 | 45351ProvenanceEnd of February 2024 (a leap year) = 2024-02-29 = serial 45351 |
Matched |
| =EOMONTH(DATE(2024,12,15),1) | Positive offset that also crosses a year boundary | 45688.0 | 45688ProvenanceEnd of January 2025 = 2025-01-31 = serial 45688 |
Matched |
LibreOffice Calc 25.8.7.3 (tested 2026-07-29)
| Formula | Description | Result | Expected | Verdict |
|---|---|---|---|---|
| =EOMONTH(DATE(2024,3,15),0) | months=0 returns the end of the SAME month as the given date | 45382 | 45382ProvenanceEnd of March 2024 = 2024-03-31 = serial 45382 |
Matched |
| =EOMONTH(DATE(2024,3,15),1) | Positive months argument moves forward to the end of a future month | 45412 | 45412ProvenanceEnd of April 2024 = 2024-04-30 = serial 45412 |
Matched |
| =EOMONTH(DATE(2024,3,15),-1) | Negative months argument moves backward to the end of a past month | 45351 | 45351ProvenanceEnd of February 2024 (a leap year) = 2024-02-29 = serial 45351 |
Matched |
| =EOMONTH(DATE(2024,12,15),1) | Positive offset that also crosses a year boundary | 45688 | 45688ProvenanceEnd of January 2025 = 2025-01-31 = serial 45688 |
Matched |
Docs & syntax
- Excel (desktop): official documentation
- Google Sheets: official documentation
- LibreOffice Calc: official documentation
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