Find the date 30 days later, three months earlier or one year ahead.
Find the date 30 days later, three months earlier or one year ahead.
Time & Date Tools
Date Add or Subtract Calculator
Add or subtract years, months, weeks and days from a date and see the resulting weekday and ISO date.
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What this tool does
Calculate deadlines, renewals, warranty periods and milestones using calendar-aware year and month changes.
Add or subtract years, months, weeks and days from a date and see the resulting weekday and ISO date.
How to use it
- 1Choose a starting date.
- 2Enter years, months, weeks and days, then choose add or subtract.
- 3Calculate and review the full date, weekday and ISO date.
Practical uses
Plan renewals, trial periods, warranties and project milestones.
Plan renewals, trial periods, warranties and project milestones.
Compatibility, privacy and limits
Time & Date ToolsBrowser local
Months have different lengths, so adding one month may roll into a different calendar day.
The result is displayed in the browser’s local time zone.
Inputs and settings are processed in the current browser by default, with no account required.
Frequently asked questions
Does Date Add or Subtract Calculator require an account?
No. It works directly in the browser.
Does Date Add or Subtract Calculator upload my input?
No. Inputs remain in the current browser by default.
Can I rely on the result for professional decisions?
Treat the result as a practical aid and verify legal, financial or compliance requirements separately.