Business Days
Working days between two dates.
±d
Date Add / Subtract
Add or subtract years, months, days, hours, minutes.
Local
2024-02-29 12:00
ISO (UTC)
2024-02-29T03:00:00.000Z
Month-end rule: years and months shift from the base day-of-month; if that day is missing in the target month, it clamps to the last day (e.g. Jan 31 + 1 month → Feb 28/29). Days, hours, and minutes are applied afterward. You can combine multiple units at once.
À propos de Date Add / Subtract
Date add/subtract answers “what date is N months or days from now?”—useful for deadlines, renewals, and reminders. Adding months needs careful month-end handling.
Pick a base date and time, then add or subtract years, months, days, hours, and minutes together. Years and months keep the original day-of-month when possible; otherwise they clamp to the last day of the target month (e.g. 2024-01-31 + 1 month → 2024-02-29). Results show in local time and ISO (UTC).
Everything runs in your browser; nothing is uploaded.
Comment l'utiliser
- Enter the base date and time
- Choose Add or Subtract, then enter years, months, days, hours, minutes
- Review the local and ISO results
FAQ
What happens when I add 1 month to January 31?
The day clamps to the end of February — the 29th in leap years, otherwise the 28th.
Can I combine multiple units?
Yes. Enter years, months, days, hours, and minutes together. Years and months apply first, then days, hours, and minutes.
Is my date sent anywhere?
No. All calculation runs in your browser.