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Days Between Dates Calculator

Use this days between dates calculator to count calendar days, weeks, and weekdays between a start date and an end date.

Method and assumptions documentedFree toolSource note included

Live calculator

Days between dates

Calendar days30 days

The end date is after the start date.

Weeks4.3 weeks

Calendar days divided by seven.

Weekdays22 weekdays

Counts Monday through Friday only.

Which date tool should I use?Choose the operation that matches the date question.
Days between dates (this tool)Use when you need the elapsed days or weeks between two calendar dates.Add or subtract timeUse when you need a new date after adding or subtracting a duration.Business daysUse when weekends and workday counting change the answer you need.

Quick answer

Days Between Dates Calculator: what it calculates

Days Between Dates Calculator calculates days between dates from start date, end date, and counting method. The visible formula is Days between dates = end date - start date.

ResultDays between dates
InputsStart date, End date, Counting method
FormulaDays between dates formula

Formula

Days between dates formula

Days between dates = end date - start date

Choose include end date when the final day should count as a full day.

How to use

Steps

  1. Enter the start date.
  2. Enter the end date.
  3. Choose whether to include the end date.
  4. Read calendar days, weeks, and weekdays.

Example

Sample calculation

Start dateMay 25, 2026
End dateJune 24, 2026
Calendar days30 days

Calculator use

Best for

  • Use this days between dates calculator to count calendar days, weeks, and weekdays between a start date and an end date.
  • Checking calendar, work-hour, school, deadline, age, or duration math before copying the result elsewhere.
  • Comparing inclusive versus exclusive dates, breaks, grading weights, or time spans with the assumptions visible.
  • Doing a quick schedule or school planning check without opening a spreadsheet.

Before relying on it

Check first

  • Mixing inclusive and exclusive date counting, time zones, overnight shifts, unpaid breaks, holidays, or school-specific grading rules.
  • Rounding time or grades too early and then using the rounded result in another calculation.
  • Treating a planning result as payroll, HR, transcript, legal deadline, or official school policy.

Details

What to know before using the result

Boundary choiceExclusive by default

The plain day count measures elapsed days from the start date up to the end date. Turn on include end date when the final date should count as a full day.

Weekday countMonday through Friday

Weekdays exclude Saturdays and Sundays. Holidays, company closure days, and regional calendars are not removed.

Date-only resultNo time of day

The calculation compares calendar dates, not exact timestamps, so daylight saving time changes do not change the day count.

Source notes

References used for this calculator

ISOISO 8601 documents Gregorian calendar date representation and time notation used for unambiguous date exchange.

Benchmarks

How to read the result

7 days: 1 week.

Common for reminders, return windows, and short deadlines.

30 days: About 1 month.

Useful for billing cycles, trials, and monthly planning.

90 days: About 1 quarter.

Useful for warranties, business planning, and project timelines.

Calculator accuracy

Methodology and assumptions

Formula

Days between dates = end date - start date

Inputs used

Start date, End date, Counting method

Limitations

Everyday results are quick planning checks. Unit choices, rounding, labels, measurements, local prices, and real-world constraints can change the final decision.

Review record

Catalog QA baseline on June 6, 2026. This date marks the catalog-wide automated and editorial QA baseline, not a tool-specific expert review.

Cite this page

Toolkit Shelf. Days Between Dates Calculator. https://toolkitshelf.com/tools/days-between-dates-calculator

FAQ

Common questions

How do I count days between two dates?

Subtract the start date from the end date. This calculator also shows weeks and weekdays.

Should I include the end date?

Include the end date when the final day should count as a full day, such as a trip or event window.

Does this count weekends?

Calendar days include weekends. The weekday result counts Monday through Friday only.