Date Difference Calculator

Include Start Date
Include End Date
Add or Subtract from a Date

Add or Subtract from a Date

Date Calculator – Calculate Days Between Two Dates

What is a Date Calculator?

A Date Calculator helps you quickly find the difference between two dates — whether it’s in days, weeks, months, or years. It’s ideal for:

  • Age calculation (e.g. from date of birth)
  • Event planning (how many days until or between events)
  • Contract timelines (track expiry dates or deadlines)
  • Financial periods (loan durations, interest accrual)

How to Use This Tool

  1. Select Start Date and End Date
  2. (Optional) Tick checkboxes to include the start or end date
  3. Click “Calculate Difference.”
  4. Instantly see the result in total days

How It Works

Behind the scenes, the calculator:

  • Converts both dates to a standard format
  • Calculates the time difference in days
  • Adds 1 day if “Include Start Date” is selected
  • Adds 1 day if “Include End Date” is selected

It’s accurate, leap-year aware, and runs 100% in your browser — no data saved.

Real-World Uses

  • Track someone’s exact age in days
  • Count down the days to a vacation or event
  • Plan project durations or milestone gaps
  • Used in numerology or astrology date mapping

Date Tips to Remember

  • Time Zones: This tool ignores time zones — perfect for general use
  • Leap Years: Fully supported
  • Start vs End: Use checkboxes to include/exclude specific dates

What can I calculate with this Date Calculator?

You can calculate the number of days, weeks, or months between two dates. It’s great for planning events, tracking deadlines, or figuring out age or durations.

Can I include the start or end date in the result?

Yes! Just check the box to include the start date, end date, or both, and the result will adjust automatically.

Does this calculator account for leap years?

Absolutely. It uses the date logic, which handles leap years and varying month lengths.

Do I need to consider time zones?

Nope. This tool calculates purely based on calendar dates — no time zones involved.

Is this tool mobile-friendly?

Yes, the layout is fully responsive and works perfectly on mobiles, tablets, and desktops.

Is my data saved anywhere?

Not at all! Everything runs in your browser. No data is collected, stored, or shared — 100% privacy-safe.