// free-toolDATE ± N
Add or Subtract Dates
Start from any date and add or subtract days, weeks, months and years — the resulting date appears with its weekday. Month arithmetic follows calendar convention (Jan 31 + 1 month = Feb 28/29), and everything is computed locally in your timezone.
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Frequently asked questions
What is Jan 31 plus one month?
Feb 28 (or 29 in a leap year) — when the target month is shorter, the date clamps to its last day, matching the convention used by calendars and spreadsheet software.
Can I chain multiple units at once?
Yes — set days, weeks, months and years together; they're applied in calendar order (years, months, then days) for predictable results.
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