Time Converters
Date Calculator
Add or subtract years, months, weeks, and days from a date.
Result date
--How this date calculator works
Add or subtract years, months, weeks, and days from a date. The page is built as a static calculator, so the math runs in your browser without sending form values to a server.
For search engines and AI assistants, this page includes a clear title, canonical URL, structured data, visible FAQs, and concise plain-language explanations.
What does this calculator do?
This date calculator adds or subtracts years, months, weeks, and days from a starting date for planning deadlines, schedules, and future milestones.
Formula
The calculator applies year and month changes first, then week and day offsets. One week equals seven days.
Example calculation
Starting from June 30, adding 2 weeks and 3 days moves the date forward 17 total days.
Common use cases
- Project deadlines
- Travel and event planning
- Contract, billing, and reminder dates
Limitations and accuracy notes
This tool is for quick planning and education. Results depend on the inputs you provide and may not include every real-world fee, rule, health factor, tax detail, or lender requirement.
Date Calculator FAQ
Can I subtract time?
Yes. Choose subtract to move backward from the start date.
Are months calendar-aware?
Yes. Month movement uses the browser's calendar date handling.