Date & Time Calculator

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

Date & Time Difference Calculator

Start Date

End Date

Start Time

End Time

Add or Subtract Days

Starting Date

Number of Days

Time 1

Time 2

Converters

Date of Birth

Number (1-3999)

Roman Numeral

How to Use

Select your calculator

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

Enter your dates or times

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

Click Calculate

Get instant results with comprehensive breakdowns

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

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