Date Calculator

Calculate days between two dates, count business days (Mon-Fri), or add/subtract...

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There are 30 days (30 days) between July 24, 2026 and August 23, 2026.

Jul 24, 2026 to Aug 23, 2026
30
days
= 30 days
4
Weeks
0
Months
720
Hours
43,200
Minutes

Weekday vs Weekend Split

20
10
20
Weekdays (Mon to Fri)
10
Weekend days (Sat, Sun)
20 weekdays + 10 weekend days = 30 total days

Jul 24, 2026 Details

Friday
Day of Week
Day 205
of Year
Week 30
ISO Week
Q3
Quarter
No
Leap Year

How Days Are Counted

Days between counts from the day after the start date through the end date, so January 1 to January 1 is 0 days and January 1 to January 2 is 1 day. All math runs on the calendar in your browser using UTC day counts, so leap years, month lengths, and daylight-saving changes never cause an off-by-one. Weekdays plus weekend days always equal the total days.

Quick answer

A date calculator finds the number of days between two dates, or adds and subtracts days, weeks, months, or years from a date. This tool runs entirely in your browser: pick a start and end date to see the exact gap in years, months, and days plus the total days, weeks, and months, or switch to add or subtract mode to get a future or past date and its day of the week. For example, 90 days after July 24, 2026 is October 22, 2026, which falls on a Thursday.

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Calculator Features

Date Difference - Days, weeks, and months between any two dates
Add or Subtract - Add days, weeks, months, or years to a date
Business Days - Skip weekends automatically
Weekday Split - Visual breakdown of weekdays vs weekends
Week Number - ISO week number for any date
Leap Year Check - See if any year is a leap year

Why Use Date Calculator?

3 Calculation Modes

Date difference, add or subtract days, weeks, months, and years, or business days, all in one tool.

Visual Weekday Split

See weekdays vs weekends with a color-coded bar chart that always adds up correctly.

Business Days Mode

Calculate deadlines that skip Saturdays and Sundays automatically.

Date Details

See week number, day of year, quarter, and leap year status for any date.

Quick Presets

One-click buttons for common intervals: 7, 14, 30, 90, 365 days.

Swap Dates

Easily swap start and end dates with one click to reverse calculations.

Common Uses

Project Deadlines

Calculate delivery dates for contracts. Add 30 business days to find when a deliverable is due.

Travel Planning

Find out how many days until your trip, or count nights for hotel bookings.

Legal Timelines

Calculate filing deadlines, response periods, or notice requirements in business days.

Personal Milestones

Count days since anniversaries, until birthdays, or between special events.

How It Works

1

Pick a Mode

Choose Date Difference to find days between two dates, Add or Subtract to find a future or past date, or Business Days to skip weekends.

2

Enter Your Dates

Use the date pickers or click 'Set to Today' for quick input. Use quick buttons for common intervals.

3

Read Your Results

See total days prominently, plus breakdowns in weeks, months, hours. For date difference, view the weekday vs weekend split.

Tips & Tricks

Quick Presets Save Time

Use the quick buttons (+7, +30, +90, etc.) instead of typing numbers. For business days, common intervals are 5, 10, 20 days.

Business Days vs Calendar Days

20 business days is about 4 calendar weeks (28 days). When planning project timelines, remember weekends add ~40% more calendar time.

Holidays Not Included

The business days calculator skips weekends but NOT holidays. For precise deadline calculations, manually subtract public holidays.

Frequently Asked Questions

Choose Date Difference mode, pick a From date and a To date, and the calculator shows the exact number of days between them, along with the gap in years, months, and days and totals in weeks, months, hours, and minutes. For example, there are 2,337 days between February 29, 2020 and July 24, 2026.
Set the From date to today (use the Set to Today button) and the To date to your target date. The result shows the number of days from now, and a countdown line tells you how many days remain until the later date.
Choose Add / Subtract mode, enter the starting date, type the number of days, and keep the unit set to Days. The calculator returns the resulting date and its day of the week. For example, 90 days after July 24, 2026 is Thursday, October 22, 2026.
In Add / Subtract mode, enter a negative number, such as -30. You can switch the unit to days, weeks, months, or years. Subtracting 1 month from March 31 gives February 28 (or February 29 in a leap year), because the result is clamped to the last valid day of the month.
No. Days between counts from the day after the start date through the end date, so January 1 to January 1 is 0 days and January 1 to January 2 is 1 day. This matches how people count days until an event, where today is not counted.
Yes. All math runs on the calendar using UTC day counts, so February 29, months with 28, 30, or 31 days, and daylight-saving changes never introduce an off-by-one error. A full leap year such as 2024 counts as 366 days.
Business days are Monday through Friday. In Business Days mode the calculator adds or subtracts only weekdays, skipping every Saturday and Sunday. It does not account for public holidays, so subtract those manually for exact deadlines.
The breakdown uses calendar logic: the difference in years and months, adjusted when the end day of the month is earlier than the start day. For example, January 15 to February 10 is 0 months and 26 days, not 1 month.

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