Date Calculator

Home Date Calculator

Days Between Two Dates

Find the number of years, months, weeks, and days between dates. Click "Settings" to define holidays.

Start Date

End Date

Special Options

Include end day (add 1 day) Exclude Saturdays Exclude Sundays Exclude both Saturdays & Sundays

Holiday Settings

No custom holidays added.

Select dates and click Calculate to see results

Total Days

0 Years

0 Months

0 Weeks

0 Days

Add to or Subtract from a Date

Start Date

years

months

weeks

days

Calculate weeks and days in business days (exclude Saturdays, Sundays and custom holidays)

Select values and click Calculate to see results

Calculated Date

Date Calculator - Calculate Days Between Dates Online

Use our online Date Calculator to quickly calculate the time between two dates or determine a future or past date by adding or subtracting years, months, weeks, and days. It is useful for deadlines, events, project schedules, payment periods, delivery estimates, academic planning, and many other everyday date calculations.

The calculator also includes flexible options for weekend exclusions and custom holidays, making it suitable for both normal calendar calculations and business-day planning. Different ISO date and time standards are available.

What is a Date Calculator?

A date calculator is a tool used to measure the time between dates or calculate a new date from a selected starting point. Instead of manually counting calendar days or working through different month lengths, the calculator performs the calculation automatically.

You can calculate days between dates, determine how many weeks or months separate two dates, or add and subtract different time periods from a specific date. Weekend and holiday options can also be used when working with business schedules.

Key Features of Our Date Calculator

Days Between Dates

Find the total number of days between a start date and an end date, together with an easy-to-read time breakdown.

Add or Subtract Dates

Add or subtract years, months, weeks, and days from any selected date to calculate a future or previous date.

Business Day Calculation

Exclude weekends and custom holidays when you need calculations based on working days rather than calendar days.

Customizable Options

Choose whether to include the final day, exclude Saturdays or Sundays, or define your own holidays.

How to Use Our Date Calculator

Calculating Days Between Two Dates

Select your starting date.
Select your ending date.
Choose whether the ending day should be included.
Select any weekend days you want to exclude.
Add custom holidays through the Settings option if required.
Click Calculate.
Review the total days and detailed date breakdown.

Weekend and holiday exclusions are particularly useful when calculating working periods, processing times, or project schedules.

Adding or Subtracting from a Date

Select the date you want to start from.
Choose Add or Subtract for each time unit.
Enter the required number of years, months, weeks, or days.
Enable the business-day option when weekends and holidays should not count.
Click Calculate.
The resulting date and day of the week will appear automatically.

This is useful when calculating deadlines, renewal dates, expiration dates, notice periods, or scheduled future events.

Customizing Holiday Settings

Click the Settings button in the first calculator.
Select + Add Holiday.
Choose the holiday date.
Enter a name for the holiday if desired.
Add additional holidays as required.
Run your calculation with the holiday exclusions applied.

Custom holidays make business-day calculations more useful when your workplace or country observes specific non-working dates.

Practical Applications of a Date Calculator

Project Management

Plan milestones, deadlines, task durations, and delivery schedules using calendar or business days.

Financial Planning

Calculate payment dates, maturity dates, billing periods, and other time-based financial deadlines.

Personal Events

Count the time remaining until birthdays, weddings, vacations, anniversaries, and other important events.

Academic Use

Calculate assignment deadlines, study periods, semester durations, and academic project schedules.

Shipping & Delivery

Estimate expected delivery dates by adding calendar days or working days to an order or dispatch date.

Rental & Subscription

Work out rental periods, subscription expirations, renewals, and notice dates more easily.

Why Choose Our Online Date Calculator?

Accurate Date Calculations: Handles changing month lengths and leap years automatically.
Flexible Options: Supports standard calendar calculations as well as weekend and holiday exclusions.
Simple Interface: Enter your dates and options without complicated settings.
Detailed Results: Quickly understand the calculated duration or resulting date.
No Registration Required: Use the calculator directly without creating an account.
Responsive Design: Works across desktop computers, tablets, and mobile devices.

Frequently Asked Questions About Date Calculators

How accurate is the date calculator?

The calculator performs calendar-based date calculations automatically and accounts for differences in month length and leap years. Accurate input dates and the correct inclusion or exclusion options are important when calculating a specific deadline or business period.

Can I calculate business days with this calculator?

Yes. Saturdays and Sundays can be excluded, and you can also add custom holidays. This is helpful for project schedules, delivery estimates, administrative processing periods, and other calculations that depend on working days.

What is the difference between calendar days and business days?

Calendar days include every day on the calendar. Business days usually represent working days and normally exclude weekends and applicable holidays. Always choose the method appropriate to the deadline or schedule you are calculating.

How far back or forward can I calculate?

This calculator is configured for dates between January 1, 1900 and December 31, 2099, providing a practical range for most personal, academic, financial, and business calculations.

Is this Date Calculator free to use?

Yes. The calculator can be used without registration or subscription and can be used repeatedly for personal or professional date calculations.

Tips for Accurate Date Calculations

Check whether your calculation requires calendar days or business days.
Confirm whether the final date should be included in the total.
Add relevant holidays when calculating working days.
For international work, remember that weekend schedules and public holidays can vary by country.
When dealing with financial or legal deadlines, verify the date-counting method required by the relevant organization.

Why Date Calculations Matter

Accurate date calculations are important for planning projects, meeting deadlines, organizing events, managing subscriptions, estimating delivery dates, and tracking important milestones. A reliable calculator makes these calculations faster and reduces the chance of mistakes caused by manually counting dates.

Whether you are determining the time between two dates or calculating a future deadline, the right date calculation can help you plan more confidently.

Related Calculators

Popular Date Calculations

90 days from today

Common for visa applications, trial periods, deadlines, and administrative requirements.

30 days from today

Frequently used for payment terms, return periods, and notice deadlines.

180 days from today

Useful for longer deadlines, warranty periods, tax matters, and immigration-related calculations.

1 year from today

Useful for annual renewals, memberships, subscriptions, anniversaries, and recurring deadlines.

Date Calculation Tips

Time Period	Business Days	Calendar Days
1 week	5 days	7 days
2 weeks	10 days	14 days
1 month	~21 days	30–31 days
3 months	~63 days	90–92 days
6 months	~126 days	181–184 days
1 year	~252 days	365–366 days

Note: Business-day estimates assume a standard Monday-to-Friday working week and do not include public holidays.