Excel End of Month
Calculate month-end dates reliably.
What this solves
Build monthly reporting boundaries. This pattern is useful when the business question is clear but a generic tutorial is too abstract.
The rule
=EOMONTH(start_date,months)
=EOMONTH(A2,0)Google Sheets: The core pattern is also usable in Google Sheets; exact function support and locale separators can differ.
Real-work checklist
- Define the business key and expected grain before writing the formula, query or markup.
- Test the pattern on a small known sample where you can verify the answer manually.
- Check missing values, duplicates and data types before trusting a large result.
- Scale to the real file or database only after the logic is proven.
Common mistake
Formatting a date as month-end does not change its underlying value.