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Date calculator: count, add or subtract dates
Calculate the duration between two dates or find a future or past date by adding or subtracting time. It is useful for due dates, project schedules, contracts, travel plans and personal milestones.
What you can use this tool for
- Counting days between two events
- Finding a project due date
- Adding weeks or months to a starting date
- Checking how long remains until a milestone
How to use it
- Choose the calculation you need.
- Enter the starting date and any ending date or interval.
- Select add or subtract when applicable.
- Read the resulting date or duration.
Frequently asked questions
Can I add months and years?
Yes. The calculator supports common date intervals including days, weeks, months and years.
Does it work for past dates?
Yes. You can compare, add to or subtract from dates in the past or future.
Are my dates saved?
No. The calculation runs in your browser and the dates are not uploaded.