How do I calculate days between two dates?

Subtract the earlier date from the later date. Our calculator handles month lengths, leap years, and gives results in days, weeks, months, years, hours, and minutes automatically.

How many business days between two dates?

Business days exclude weekends (Saturday and Sunday). In a typical month, there are about 22 business days. Our calculator counts actual business days between your specific dates.

Does the calculator account for leap years?

Yes. Leap years (every 4 years, with exceptions) add February 29th. The calculator handles all leap year rules automatically for precise day counts.

How many days are in a year?

Regular year: 365 days. Leap year: 366 days. Average over 400 years: 365.2425 days. This is why we need leap years to keep the calendar aligned with Earth's orbit.

How do I calculate weeks between dates?

Divide total days by 7. 90 days = 12 weeks and 6 days. Our calculator shows both full weeks and remaining days automatically.

What is the difference between calendar days and business days?

Calendar days include all days. Business days exclude weekends (and optionally holidays). 30 calendar days typically contains 22 business days. Important for contracts and deadlines.

How many days until a specific date?

Set the start date to today and the end date to your target. The calculator shows exact days remaining. For countdown functionality, see our Countdown Timer calculator.

How do I calculate months between dates?

The calculator shows exact years, months, and days. It accounts for varying month lengths (28-31 days). 90 days from Jan 1 is not the same number of months as 90 days from March 1.

Can I calculate dates in the past?

Yes. Set any start and end date in any order. The calculator works with past, present, and future dates. It shows whether the result is past or future.

How many working hours between two dates?

Multiply business days by 8 (standard work hours). 22 business days = 176 working hours. Our calculator shows total hours for all calendar days; apply the 8-hour conversion yourself.

Days Between Dates Calculator - Free Date Difference (2026)

Date Difference

Complete breakdown between your dates

Total Days

Exact

2m 29d

Weeks

12w 6d

Business Days

Full Breakdown

Metric	Value

// Lifestyle · ShashaTools

Days Between Dates

Start Date

End Date

// Results

Days Between

90 days

Calendar Days

90 days

Exact

0 years, 2 months, 29 days

Weeks

12 weeks and 6 days

Hours

2,160 hours

Business Days

64 business days (26 weekend)

90 days between dates

How to Use This Calculator

Find the difference between any two dates

Step 1 Enter Dates

Pick start date

Any date past, present, or future. This is the earlier of the two dates (or the calculator handles the order for you).

Pick end date

The second date. Can be before or after the start date. The calculator shows the absolute difference regardless of order.

Read the difference

Total calendar days, exact years/months/days, weeks, hours, minutes. Plus business days (Mon-Fri) and weekend days separately.

Use the breakdown table

Full breakdown including which day of the week each date falls on. The doughnut shows business vs weekend day proportion.

💡 Quick reference: A typical month has 22 business days. A quarter has ~65. A year has ~261. Our calculator counts actual business days for your specific date range.

Step 2 Use Cases

Project deadlines

How many business days until your deadline? Enter today and the due date. Multiply by 8 for working hours available.

Contract periods

Contracts often specify “30 calendar days” or “30 business days.” This calculator shows both so you know the actual end date.

Travel planning

How many days until your trip? How long is your vacation? Enter departure and return dates for exact trip duration.

Age verification

Need exact days between a birthdate and a specific event? Enter both dates. Useful for eligibility calculations.

💡 Tip: For ongoing countdowns (days until a wedding, launch date, etc.), use our Countdown Timer calculator which updates in real-time.

// Related Calculators

🎂

Age Calculator

Exact age from date of birth.

⏱️

Countdown Timer

Live countdown to any date.

🌍

Time Zone Converter

Convert times across time zones.

💤

Sleep Cycle Calculator

Plan optimal sleep and wake times.

// Complete Guide — Updated 2026

Calculating Days Between Dates:
The Complete Guide

Whether you are counting down to a deadline, planning a project timeline, or figuring out how many business days until delivery, knowing the exact days between two dates is essential. This guide covers how date math works, the difference between calendar and business days, and practical applications.

The Date Difference Formula

// Days Between

Days = End Date − Start Date (accounting for month lengths & leap years)

Jan 1 to Apr 1 = 31 + 28 + 31 = 90 days (non-leap) or 91 (leap)

Business Days Reference

Period	Calendar Days	Business Days
1 Week	7	5
1 Month	30-31	~22
1 Quarter	90-92	~65
1 Year	365	~261

Real-World Scenarios

Scenario 1: Project Deadline. James starts a project on April 17 with a deadline of July 15. That is 89 calendar days or ~64 business days. At 8 hours/day: 512 working hours available. If the project needs 400 hours, he has 112 hours of buffer. Use our Countdown Timer to track it.

Scenario 2: Contract Notice Period. Maria’s contract requires “60 business days notice.” Starting today (April 17), 60 business days = approximately July 8, 2026 (not June 16 which would be 60 calendar days). Business vs calendar makes a 3-week difference.

Scenario 3: Vacation Planning. David flies out August 1 and returns August 14. Trip duration: 13 days = 1 week and 6 days. He needs to request 10 business days off (2 full work weeks). Use our Time Zone Converter for international trips.

Scenario 4: Pregnancy Tracking. Priya’s last period was February 6. She wants to know how many days until her due date (November 13). Answer: 280 days from LMP. She is currently 70 days in (10 weeks). Use our Pregnancy Due Date Calculator for full milestone tracking.

💡 Key insight: Always clarify “calendar days” vs “business days” in contracts and deadlines. 30 business days is actually 42 calendar days (6 weeks). This distinction has caused countless missed deadlines and contract disputes. When in doubt, ask.

Days per Month

Jan, Mar, May, Jul, Aug, Oct, Dec	31
Apr, Jun, Sep, Nov	30
February	28/29

// Frequently Asked Questions

Common Questions About Date Differences

How do I calculate days between dates? +

Subtract earlier from later date. Calculator handles month lengths, leap years. Shows days, weeks, months, years, hours, minutes.

How many business days between dates? +

Business days exclude Sat/Sun. ~22 per month, ~65 per quarter, ~261 per year. Calculator counts actual business days for your range.

Does it account for leap years? +

Yes. Leap years add Feb 29. Calculator handles all leap year rules automatically for precise counts.

How many days in a year? +

Regular: 365. Leap: 366. Average over 400 years: 365.2425. Leap years keep calendar aligned with Earth's orbit.

How to calculate weeks between dates? +

Divide total days by 7. 90 days = 12 weeks and 6 days. Calculator shows full weeks + remaining days.

Calendar vs business days? +

Calendar = all days. Business = Mon-Fri only. 30 calendar days ≈ 22 business days. Critical for contracts and deadlines.

Days until a specific date? +

Set start to today, end to target. Shows exact days. For live countdowns, use our Countdown Timer calculator.

How to calculate months between dates? +

Calculator shows exact years, months, days. Accounts for varying month lengths (28-31). More precise than dividing days by 30.

Can I use past dates? +

Yes. Any date order works. Calculator shows absolute difference and indicates if result is past or future.

Working hours between dates? +

Multiply business days by 8. 22 business days = 176 working hours. Calculator shows calendar hours; apply 8-hour conversion yourself.

Days BetweenDates

Calculating Days Between Dates:The Complete Guide

The Date Difference Formula

Business Days Reference

Real-World Scenarios

Days Between
Dates

Calculating Days Between Dates:
The Complete Guide