Days Between Dates Calculator

Enter a start date and an end date to get the exact number of days between them, plus a weeks/days split, business days, and a years-months-days breakdown.

Quick Facts

Method
Calendar-day count between two Gregorian dates
Total days = |End − Start| in calendar days at UTC midnight, +1 if counting both dates inclusively. Weekdays exclude Saturdays and Sundays only (no holiday calendar).

Your Results

Calculated
Total days
-
Calendar days between the dates
Weeks & days
-
Total days as weeks + remainder
Weekdays
-
Business days, Monday–Friday only
Years, months, days
-
Calendar-aware breakdown

Ready

Choose a start date and end date, then press Calculate.

Understanding the Days Between Dates Calculator

This calculator finds the number of days between two calendar dates using standard date arithmetic. Enter a start date and an end date; the tool converts each to a UTC midnight timestamp so the count is not thrown off by daylight saving time, then reports the difference in four useful forms: total days, weeks and days, weekdays only, and a years/months/days breakdown.

The core formula

  • Total days = |End date − Start date|, counted as whole calendar days.
  • Exclusive counting (the default) counts the days that elapse between the two dates — like counting nights of a hotel stay.
  • Inclusive counting adds 1 to also count both the start date and the end date as full days — useful for questions like "how many days is my trip, including both the day I leave and the day I return?"

Business days and calendar breakdowns

The weekday count applies the standard convention of Monday through Friday only, treating Saturday and Sunday as non-business days. It does not remove public holidays, since those vary by country, region, and organization. The years/months/days figure is calculated using real calendar arithmetic — borrowing days from the previous month and months from the previous year exactly the way a calendar works — so it correctly handles months of different lengths and leap years.

Common uses

  • Project deadlines and milestone planning
  • Legal and contractual date calculations (90-day cure periods, notice windows)
  • Trip length, countdowns, and anniversary or elapsed-time tracking
  • Payroll, billing, and other cycles counted in business days

Precision note

If a calculation has legal or contractual significance, confirm which counting convention applies — some agreements count the first day, some count only the last, and business-day deadlines often use their own holiday calendar that this general-purpose tool does not know about.

Frequently Asked Questions

How is the number of days between two dates calculated?
The calculator converts both dates to UTC midnight timestamps and finds the difference in whole days: total days equals the absolute difference between the end date and the start date. Working in UTC avoids errors from daylight saving time changes that can occur when comparing dates in local time.
What is the difference between exclusive and inclusive counting?
Exclusive counting, the default, measures the days that pass between the two dates, like counting nights of a stay — January 1 to January 10 is 9 days. Inclusive counting adds 1 to count both the start date and the end date themselves, so January 1 to January 10 inclusive is 10 days.
How are weekdays (business days) counted?
The calculator counts Monday through Friday within the date range and excludes Saturdays and Sundays. It does not exclude public holidays, since holiday calendars vary by country and organization — subtract known holidays manually if your deadline depends on them.
Does the calculator account for leap years?
Yes. Because the calculation works from real calendar dates rather than a fixed 365-day year, it automatically includes February 29 whenever a leap year falls within the selected range.

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