Professional Date Calculator
Days Between Two Dates
Calculate the exact duration between two dates in years, months, and days. Customize with your country's holidays.
Calculation Settings
Custom Holidays
Add your own holidays to exclude from business day calculations:
Total days: 2
Business days: 2
Years: 0
Months: 0
Weeks: 0
Days: 2
Add or Subtract from a Date
Calculate a future or past date by adding or subtracting time periods.
About Date Calculations
The Gregorian Calendar System
The Gregorian calendar is the international standard for civil use today. It was introduced in 1582 to correct errors in the Julian calendar that had accumulated over centuries.
Key features of the Gregorian calendar:
- A standard year has 365 days
- Leap years add an extra day (February 29) every 4 years
- Century years are only leap years if divisible by 400
- Months have 30 or 31 days except February (28 or 29)
This calendar was gradually adopted worldwide over several centuries and provides the most accurate alignment with Earth's revolution around the Sun.
Understanding Global Holidays
Holidays vary significantly by country and culture. Our calculator allows you to customize which days are excluded from business day calculations.
Common Holiday Types:
- Fixed-date holidays: Occur on the same date each year (e.g., Christmas on December 25)
- Floating holidays: Occur on a specific weekday of a month (e.g., US Thanksgiving on 4th Thursday of November)
- Lunar-based holidays: Vary by lunar cycles (e.g., Easter, Chinese New Year)
- National observances: Country-specific days (e.g., Independence Days)
2023 US Federal Holidays
| Holiday | Date |
|---|---|
| New Year's Day | January 1, 2023 |
| Martin Luther King Jr. Day | January 16, 2023 |
| President's Day | February 20, 2023 |
| Memorial Day | May 29, 2023 |
| Juneteenth | June 19, 2023 |
| Independence Day | July 4, 2023 |
| Labor Day | September 4, 2023 |
| Columbus Day | October 9, 2023 |
| Veterans Day | November 11, 2023 |
| Thanksgiving | November 23, 2023 |
| Christmas Day | December 25, 2023 |
How to Use This Date Calculator
Our tool offers two main functions with customization options:
1. Days Between Dates
- Select your start and end dates using the dropdowns or date picker
- Click "Calculate Duration" to see the time between dates
- Use Settings to exclude weekends and add custom holidays
- View detailed results including business days and breakdown by years/months/weeks
2. Add/Subtract from Date
- Enter your base date
- Choose whether to add or subtract time
- Enter the number of years, months, weeks, or days to adjust
- Click "Calculate New Date" to see the result
- The result shows the new date and the day of the week
Holiday Customization
- Select your country to preload common holidays
- Add custom holidays for your specific needs
- Remove any holidays that don't apply to your situation
- Toggle weekend exclusion for business day calculations
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