Date Calculator – Add to or Subtract From a Date

How to use the date calculator?

This Date Calculator is designed to simplify date arithmetic for everyone. Here’s how to use it:

1. 1. Start Date: Choose any date—today, a past event, or a future milestone. It’s filled in with today’s date Automatically;

   2. Enter Time: Input years, months, weeks, and days in any combination. For example:

      • “30 days”

      • “3 month and 2 weeks” 

      • “2 weeks and 3 days” 

      • “1 year, 5 months”
   3.  Check Business Days Only to exclude weekend days in your calendar calculation. where the weekdays from Monday through Friday.

   4. Calculate: Click Add or Subtract button to find the new date.

   5. Clear: Click the clear button to clear the results and reset the start date to today’s date.

When to use this Date Calculator?

Whether planning personal milestones or professional deadlines, this calculator adapts to your needs. Use it to:

• Schedule vacations (“Add 6 weeks and 4 days to today”).

• Track project timelines (“45 workdays from now” for client deliverables).

• Calculate medical follow-ups (“3 weeks and 2 days post-appointment”).

• Reverse-engineer dates (“If my visa expires in 90 days, when should I renew?”).
  Students rely on it for exam prep, travelers for countdowns, and professionals for contract deadlines—all with precision.

Holidays

This date calculator does not deal with holidays. If you do not want count the holidays as non-business days you should extend your final date to include the number of holidays in the schedule.

Federal Holidays from the U.S. Office of Personnel Management.

Data Safe

Yes, your privacy is a priority. The tool runs entirely in your browser—no data is sent to servers, tracked, or stored. Whether calculating sensitive project deadlines or personal events, your information stays 100% local and secure.

Alternative Uses for the Date Calculator

Many people use the Date Calculator to determine common time frames, such as 20, 30, 60, 90, 120, or 180 days from a specific date or from today. These calculations are often needed for contract deadlines, business payment terms, legal matters, and other important timelines.

You can easily find a future date by adding 30, 60, 90, 120, or 180 days to a given date. The calculator also allows you to determine the number of business days from a specific date.

Similarly, you can calculate past dates, such as finding out what the date was 30, 60, 90, 120, or 180 days ago.

Does it handle complex time combinations?

Yes! Mix years, months, weeks, and days freely:

• “Add 2 months + 3 weeks – 5 days” for event planning.

• “Subtract 1 year and 6 months” to trace back to historical milestones.
  Even leap years or month-end transitions (e.g., February 28 to March 1) are resolved accurately.

Is it mobile-friendly?

Yes, Designed for smartphones first, the interface shines on smartphones. Large, tactile buttons and swipe-friendly date pickers make it easy to use one-handed. Whether you’re a parent scheduling soccer practices or a freelancer tracking invoices, the design adapts to your rhythm—no clutter, no learning curve.

Are the calculations accurate?

Absolutely. Every result is validated against trusted tools like Google Calendar and Excel, even handling complex scenarios like leap years or month-end transitions. For example, adding 1 month to February 28 seamlessly resolves to March 28 (or March 29 in leap years). Workday Mode skips weekends flawlessly, ensuring deadlines never land on Saturdays or Sundays.

Is it free?

Yes, completely free, forever. No sign-ups, no hidden fees. From calculating “10 workdays before Christmas” to planning “2 months and 15 days for a renovation project”, every feature is accessible without restrictions.

Can I use it for professional projects?

Absolutely. Professionals rely on it for:

• Deadlines: “Add 30 workdays to today” for contract deliveries.

• Event coordination: “Subtract 6 weeks from the conference date” to book venues.

• Financial planning: Calculate loan payment dates or billing cycles.

What makes it better than other Calculator?

• Flexibility: Combine any time units (e.g., “3 months + 10 workdays”).

• Accuracy: Matches Google Calendar and Excel results.

• Universal design: Works for students, travelers, parents, or CEOs.

Try this Date Calculator today—where simplicity meets precision, time management becomes effortless. and every second counts.