Days Between Dates
Calculate days between any two dates: results in days, weeks, months & years. Business days with national holidays, milestone finder & date math. Free, no signup.
Updated May 2026
How to Calculate Days Between Dates
Calendar days or business days, with holidays from 7 countries
1. Enter the two dates
Start date and end date — order doesn't matter, the result is always positive.
2. Choose a counting mode
Calendar days, business days (skipping weekends), or business days that also exclude national holidays.
3. See the result and milestones
Total days, weeks, months, and the exact date of automatic milestones like 100 days or 1 year.
What This Days Between Dates Calculator Does
Holiday calendars for 7 countries, not just the US
Calendar days vs. business days
Switch between a simple day count and one that excludes weekends and holidays.
Holidays for 7 countries
Brazil (12 national holidays), the United States, Spain, Germany, France, Italy, and Portugal.
Automatic milestone finder
Finds and highlights dates like 100 days, 1 year, 500 days, 2 years, 1,000 days, and 5 years.
Add or subtract days from a date
A dedicated tab calculates a new date from a base date plus or minus N days, counted as calendar or business days.
Example Scenarios
How to configure the calculator for common situations
When You'll Use This Tool
The most common scenarios among people who use this calculator
Legal and contract deadlines
Tell calendar days apart from business days exactly the way a contract clause requires.
Anniversaries and milestones
Celebrate automatic milestones like 100 days or 1,000 days together.
Project planning
Work out delivery deadlines counting only business days on the calendar.
Trip planning
Count down the days until a trip, with or without holidays factored in along the way.
Common Mistake? Start Here
Mixing up calendar days and business days in legal deadlines
Many contracts and labor laws draw a clear line between the two — using the wrong mode can shift a deadline by days without anyone noticing.
Forgetting local holidays outside your own country
When calculating international deadlines, pick the correct country — national holidays vary a lot between the US, Brazil, and Europe.
Counting the start date twice
The difference between two dates doesn't include the start date itself by default, only the full days between the two.
Why Use This Days Between Dates Calculator
The automatic milestone finder (100 days, 1 year, 500 days, 2 years, 1,000 days, 5 years) is a rare feature among date calculators — most tools only show the raw difference and leave the rest of the math to you.
Holiday calendars for seven countries — Brazil, the United States, Spain, Germany, France, Italy, and Portugal — keep business-day counts accurate for international deadlines, not just a single market.
Calendar Days vs. Business Days
Which mode to use in each situation
Frequently Asked Questions
Select "Business Days" mode and, if needed, turn on the holiday calendar for the relevant country. The calculator automatically skips Saturdays, Sundays, and the selected holidays, then shows the business-day total separately from the calendar-day total.
Further Reading
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