Add or Subtract Days from Date
Add or subtract days, weeks, or months from any date. Find out what date it will be in 30 days, 6 weeks, or 3 months from now.
Built by Michael Lip
Frequently Asked Questions
How do I add days to a date?
Enter your starting date, specify the number of days to add (or subtract with a negative number), and click Calculate. The tool shows the resulting date with day of week.
Can I add weeks or months instead of days?
Yes. Select the unit (days, weeks, or months) from the dropdown before calculating. Adding 2 weeks is equivalent to adding 14 days, while adding months accounts for varying month lengths.
What date is 90 days from today?
Enter today's date and add 90 days. The tool computes the exact result including month and year boundaries. Click the 'Today' button to quickly set the start date.
How does adding months work for the 31st?
When adding months would land on a date that does not exist (e.g., adding 1 month to January 31 gives February 31), the result rolls to the last valid day of that month (February 28 or 29).
How It Works
This tool runs entirely in your browser using vanilla JavaScript. No data is sent to any server. All conversions and calculations happen locally on your device, ensuring complete privacy.
EpochPilot uses the browser's built-in Intl.DateTimeFormat API and the IANA timezone database provided by your operating system. This means timezone conversions are always accurate, including Daylight Saving Time transitions.
Related Tools
Privacy
Everything runs locally in your browser. No timestamps, dates, or personal data are transmitted to any server. The source code is open on GitHub.
Contact
EpochPilot is built and maintained by Michael Lip. For questions or feedback, email [email protected].