How to get the first day of next month
✓ Verified in LibreOffice 25.8.7.3Roll any date forward to the 1st of the following month — for billing cycles, subscription renewals, and month-start schedules.
The formula
| App | Formula | Notes |
|---|---|---|
| Excel | =EOMONTH(A2,0)+1 | EOMONTH(A2,0) is this month's last day; +1 lands on the 1st of next month. Works regardless of the day in A2. |
| Google Sheets | =EOMONTH(A2,0)+1 | Identical. =DATE(YEAR(A2),MONTH(A2)+1,1) also works and self-corrects across December. |
| LibreOffice Calc | =EOMONTH(A2,0)+1 | Identical. |
How it works
EOMONTH(date, 0) jumps to the last day of the date's own month, so adding 1 always lands on the first day of the NEXT month — here 15 Aug 2026 → 31 Aug → 1 Sep 2026. Because it's anchored to month-end rather than doing arithmetic on the day number, it doesn't care whether the month has 28, 30 or 31 days, and it rolls over the year end cleanly (EOMONTH of any December + 1 = 1 January). The DATE(YEAR,MONTH+1,1) form gives the same answer and also handles the December wrap, since month 13 rolls into the next January. For the first day of the CURRENT month use DATE(YEAR(A2),MONTH(A2),1) or A2-DAY(A2)+1; for N months ahead, EOMONTH(A2,N-1)+1. Format the result cell as a date, since the formula returns a date serial number.
Verified, not just documented
We ran =TEXT(EOMONTH(DATE(2026,8,15),0)+1,"YYYY-MM-DD") in LibreOffice 25.8.7.3 (headless, with forced recalculation) and it returned 2026-09-01 — exactly the expected result. Every formula here is confirmed by actually executing it.
Functions used
EOMONTH — see full Excel, Google Sheets & LibreOffice compatibility for each.
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