What is the Days Between Dates Calculator?

The Days Between Dates Calculator is a simple yet powerful tool that instantly calculates the exact number of days between any two dates. Whether you need to know how many days until an event, calculate project timelines, or figure out billing periods, this calculator gives you the answer in seconds.

Smart calculation: Results update in real-time as you change dates or options — no need to press a "Calculate" button.

What Can You Calculate?

This tool goes beyond just counting days. When you select two dates, you'll see comprehensive information:

Total Days

Exact count between dates with optional end date inclusion

Exact Duration

Broken down into years, months, and days

Business Days

Working days excluding weekends

Time Conversions

Weeks, hours, minutes, and seconds

Calendar Info

Weekend days, full weeks, months, and years

Weekday Breakdown

Visual chart showing count of each day of the week

Flexible Weekend Settings

Not every country follows the same work week. This calculator lets you choose your weekend days to match your region:

Saturday & Sunday

Most common worldwide — used in North America, Europe, and most of Asia

Friday & Saturday

Used in many Middle Eastern and North African countries

Thursday & Friday

Used in some countries with specific regional needs

Single Day Options

Friday only or Sunday only for specific regional requirements

Automatic updates: Changing the weekend setting instantly recalculates all results, including business days, the weekday breakdown chart, and the calendar view.

How to Use the Calculator

Select Your Dates

Click the Start Date field to open the date picker and choose your first date. Then click the End Date field to select your second date.

Quick tip: Click the Today button below each field to instantly set it to today's date.

Adjust Options

Customize the calculation using the options below the date fields:

Include end date — Check this box to add one extra day to the count. Useful when both the start and end dates should be counted (e.g., vacation days, hotel stays)
Weekend — Select which days are considered weekends in your region. This affects business day calculations, the weekday breakdown chart, and calendar highlighting

View Your Results

Results appear instantly as soon as both dates are selected:

Main Result Card

Total days, exact duration (years, months, days), and business day count

Time Units

Converts total into weeks, hours, minutes, and seconds

Calendar Info

Weekend days, full weeks, full months, and full years in the range

Weekday Breakdown

Visual chart showing how many of each weekday fall within the range

Calendar View: Displays a scrollable visual calendar with color-coded dates — indigo for start date, red for end date, light tint for in-range days, and orange border for today.

Copy or Swap

Click Copy Result to copy a text summary of the calculation to your clipboard
Use the swap button between the date fields to quickly switch the start and end dates

Automatic Saving: Your selected dates and options are automatically saved in your browser. When you return to the tool, your last calculation will be restored.

Key Features

Essential Calculation Features

Instant Calculation

Get exact number of days between any two dates instantly. Calculation updates in real-time as you change dates or options.

No "Calculate" button needed
Immediate results
Real-time updates

Include End Date Option

By default, counts days between dates (exclusive). Enable to add one extra day for inclusive ranges.

Perfect for vacation days
Rental periods
Event durations

Exact Duration Breakdown

For longer date ranges, see the exact duration in years, months, and days alongside the total day count.

Human-readable format
Precise calculation
Multiple formats

Business Days Counter

Automatically counts working days (excluding weekends) in the selected range.

Work schedule planning
Project timelines
Billing cycles

Customization & Conversion Options

Custom Weekend Selection

Choose from five weekend options to match your country or region.

Sat-Sun (most common)
Fri-Sat (Middle East)
Thu-Fri (some regions)
Single day options

Time Unit Conversions

See the date range expressed in multiple time units for different use cases.

Weeks and days
Total hours
Total minutes
Total seconds

Calendar Information

View supplementary data about the selected date range.

Weekend days count
Full weeks
Full months
Full years

Swap Dates

Quickly swap the start and end dates with a single click.

One-click swap
Instant recalculation
Convenient reversal

Visual Analysis & Data Management

Weekday Breakdown Chart

A horizontal bar chart shows how many of each weekday appear in the date range.

Monday through Sunday
Weekend bars styled differently
Easy identification

Visual Calendar View

A scrollable calendar displays all months in the date range side by side.

Color-coded dates
Horizontal scrolling
Today highlighted
Up to 36 months

Copy to Clipboard

Copy a text summary of your calculation with one click.

Start and end dates
Total days
Exact duration
Business days

Persistent Settings

Your preferences are automatically saved and restored.

Selected dates saved
Include end date preference
Weekend setting
Browser local storage

Frequently Asked Questions

How does the calculator count days?

By default, the calculator counts the number of days between the start and end dates, not including the end date itself.

Default (Exclusive)

January 1 to January 3

Result: 2 days
Counts: Jan 1 → Jan 2
End date not included

Include End Date

January 1 to January 3

Result: 3 days
Counts: Jan 1 → Jan 2 → Jan 3
End date included

What are business days?

Business days (also called working days) are the days that are not weekends. By default, this means Monday through Friday.

Customizable: You can change which days count as weekends using the Weekend dropdown to match your region's work week.

Excludes weekend days
Adapts to regional settings
Perfect for project planning
Useful for billing cycles

Does it handle leap years correctly?

Yes. The calculator correctly accounts for leap years in all calculations.

Example: Calculating from February 1 to March 1 in a leap year will return 29 days instead of 28.

Leap year rules are automatically applied based on the Gregorian calendar system.

What if I enter the end date before the start date?

The calculator automatically handles this — it will swap the dates internally so the earlier date is always the start.

No error messages
Automatic correction
You can also use the swap button to manually switch the dates

How does the "Include end date" option work?

When enabled, the tool adds 1 to the total day count. This is useful when you want to count both the start and end dates as part of the range.

Common Use Cases:

Hotel stays — Check-in to check-out dates
Vacation days — First day to last day of leave
Event durations — Start date to end date inclusive
Rental periods — First day to last day of rental

Can I use different weekend days?

Yes. The calculator supports five weekend configurations to match different regional work weeks:

Saturday-Sunday

Most common worldwide

Friday-Saturday

Middle East & North Africa

Thursday-Friday

Some specific regions

Single Day

Friday only or Sunday only

Automatic updates: Changing the weekend setting affects business day counting, the weekday breakdown chart, and the calendar view highlighting.

Is there a limit to the date range?

The calendar view displays up to 36 months for optimal performance and usability.

No calculation limit: There is no limit on the date calculation itself — you can calculate the difference between dates that are decades or even centuries apart.