DAYS
Supported, behaves as documentedCategory: Date and time · Last tested 2026-08-06
Real, executed compatibility results for the DAYS function across Microsoft Excel, Google Sheets, and LibreOffice Calc — verified by actually running it. Syntax and links to each vendor’s official documentation are below.
Support matrix
| Engine | Documented | Live-tested | Verdict |
|---|---|---|---|
| Excel | Yes | Not yet | n/a |
| Google Sheets | Yes | Not yet | n/a |
| LibreOffice Calc | Yes | Yes (25.8.7.3, 2026-08-06) | Supported, behaves as documented |
LibreOffice version history
We executed the same test cases under each LibreOffice release to show exactly when DAYS’s support changed — not documentation claims, real results.
| LibreOffice version | Verdict | Tested |
|---|---|---|
| 24.2.0.3 | Supported, behaves as documented | 2026-07-19 |
| 24.8.7.2 | Supported, behaves as documented | 2026-07-19 |
| 25.2.0.3 | Supported, behaves as documented | 2026-07-24 |
| 25.8.7.3 | Supported, behaves as documented | 2026-08-06 |
Executed test cases
LibreOffice Calc 25.8.7.3 (tested 2026-08-06)
| Formula | Description | Result | Expected | Verdict |
|---|---|---|---|---|
| =DAYS(DATE(2024,3,15),DATE(2024,3,1)) | DAYS takes END_DATE FIRST, then start_date -- the opposite argument order from DAYS360/YEARFRAC. Verified via https://support.microsoft.com/en-us/office/days-function-57740535-d549-4395-8728-0f07bff0b9df ("DAYS(end_date, start_date)") | 14 | 14 2024-03-15 minus 2024-03-01 = 14 days |
Matched |
| =DAYS(DATE(2024,3,1),DATE(2024,3,15)) | Swapping which date is passed first (now the earlier date is 'end_date') flips the sign -- reinforcing that argument order is significant and not auto-corrected | -14 | -14 Same two dates as DAYS_basic_end_first_argument_order but with roles swapped -> -14 |
Matched |
| =DAYS("15-MAR-2021","1-FEB-2021") | Microsoft's own documented example, using text dates parsed as if by DATEVALUE | 42 | 42 Exact example from the DAYS function documentation |
Matched |
| =DAYS(DATE(2021,12,31),DATE(2021,1,1)) | A second literal example from the same Microsoft documentation page | 364 | 364 Dec 31, 2021 minus Jan 1, 2021 = 364 days |
Matched |
Docs & syntax
- Excel: official documentation
- Google Sheets: official documentation
- LibreOffice Calc: official documentation