Date Duration Calculator

Calculate the number of days between two dates, or find a future date.

📅 Calculate Days Between Dates

âž•âž– Add or Subtract Days

How to Calculate Days Between Two Dates

Determining the exact number of days between two dates is essential for project planning, visa tracking, and event countdowns. While you can count manually on a calendar, this method is prone to "off-by-one" errors—forgetting to include leap years or miscounting the specific end date.

Why use a Date Duration Calculator?
Our tool uses the standard Gregorian calendar system to ensure 100% accuracy. It automatically accounts for:

  • Leap Years: February 29th is automatically included in calculations.
  • Month Lengths: Automatically adjusts for months with 30 vs 31 days.
  • Time Zones: We calculate based on absolute date differences, independent of your local clock.

Common Uses for Date Calculations

1. HR and Payroll

Calculating an employee's exact tenure or determining the specific number of days for prorated pay periods.

2. Visa & Travel Compliance

Many countries (like the Schengen Zone) have strict "90 days out of 180" rules. Use this calculator to ensure you do not overstay your welcome.

3. Project Management

Calculate the exact duration of "sprints" or deadlines to ensure deliverables are met on time.

4. Health & Fitness

Track how many days you have been sober, smoke-free, or sticking to a new diet.

How to Add or Subtract Days from a Date

Need to know the date 90 days from today? Simply enter your start date and the number of days you wish to add (or use a negative number to subtract). This is frequently used for:

  • Warranty Expirations: Find the exact date a 1-year or 90-day warranty ends.
  • Legal Deadlines: Calculate the response date for court documents (often 30 or 60 days).
  • Pregnancy Milestones: Estimate due dates or trimester shifts by adding 280 days to a conception date.

Disclaimer: This calculator is provided for informational purposes. While every effort is made to ensure accuracy, please consult legal or financial professionals for critical deadlines.