Date & Time Calculator

Calculate differences between dates and times, workdays, age, and more.

Date Difference Calculator

Calculate Time Difference

Add or Subtract Days

Age Calculator

How to Use

1

Select your calculator

Choose from Date Difference, Time Difference, Add/Subtract, Age, or Workdays tabs

2

Enter your dates or times

Use the date/time pickers or click "Today"/"Now" for quick access to current values

3

Click Calculate

Get instant results with comprehensive breakdowns

4

Review the results

See detailed breakdowns in years, months, weeks, days, and more

About

What is the Date & Time Calculator?

The Date & Time Calculator is a versatile tool designed to handle all your date and time calculation needs. Whether you're a project manager tracking deadlines, an HR professional calculating workdays, or someone curious about time spans, this tool provides accurate results instantly.

With four powerful calculators in one interface, you can calculate date differences, time durations, add or subtract days, determine exact age.

Key Features

Date Difference Calculator

Calculate the exact time between any two dates with a comprehensive breakdown showing years, months, days and workdays.

Time Duration Calculator

Find the duration between two times in hours and minutes. Automatically handles overnight time spans, making it ideal for shift workers, travel planning, and time tracking.

Add/Subtract Days

Add or subtract any number of days from a starting date to find future or past dates. Useful for deadline calculations, payment terms, and warranty expiration dates.

Age Calculator

Calculate exact age from birth date in multiple units: years, months, days, weeks, and even hours.

Frequently Asked Questions

How are workdays calculated?
The workdays calculator counts Monday through Friday as working days and excludes Saturdays and Sundays. It does not account for public holidays, which vary by country and region. For holiday-adjusted calculations, you'll need to manually subtract those days from the result.
Can I calculate overnight time differences?
Yes! The time difference calculator automatically handles overnight spans. For example, if you enter 10:00 PM as start time and 2:00 AM as end time, it will correctly calculate 4 hours, understanding that the end time is on the next day.
How accurate are the date calculations?
All calculations use JavaScript's built-in Date object, which accurately handles calendar complexities like leap years, different month lengths, and daylight saving time transitions. The results are precise down to the day level.
Does this tool handle different timezones?
The current version uses your local timezone for all calculations. The date difference calculator is timezone-independent since it works with calendar days.
Is my data stored or sent anywhere?
No! All calculations are performed entirely in your browser. No dates, times, or calculation results are sent to any server or stored anywhere. The tool works completely offline once the page is loaded, ensuring complete privacy.
What date formats are supported?
The calculator uses standard date and time inputs, which typically display in your browser's locale format (e.g., MM/DD/YYYY for US, DD/MM/YYYY for Europe). The date picker ensures you always enter dates in a valid format. Results are shown in both numeric and long-form readable formats.

What's upcoming?

Custom Holidays

Add public holidays for your region to get accurate workday calculations

Planned

Timezone Support

Calculate time differences across different timezones

Planned

Business Hours Calculator

Calculate working hours excluding lunch breaks and custom schedules

Planned

Date Patterns

Find recurring dates (e.g., every 2nd Monday) and patterns

Planned

Date History

Save frequently used calculations for quick access

Planned

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