Date Calculator – Calculate Days Between Date and Add Time

Need to find out how many days are left until an important event? Or perhaps you want to calculate an exact date by adding or subtracting years, months, weeks, or days? Our Free Online Date Calculator is designed to help you quickly solve all your date-related calculations in just a few clicks!

Whether you are planning a project timeline, tracking a pregnancy, counting down to a holiday, or calculating legal/official deadlines, this easy-to-use tool delivers instant and accurate results.

Find the number of days between two dates.

Modify the values and click the calculate button to see result.

Start Date

End Date

Include End Day (add 1 day)

Clear

Add to or Subtract from a Date

Find the date by adding or subtracting from a selected date.

Modify the values and click the calculate button to see result.

Start Date

Add + Subtract -

Years

Months

Weeks

Days

Clear

What is a Date Calculator?

A Date Calculator is a versatile digital tool that allows users to perform various time-based calculations automatically. Instead of manually counting days on a calendar—which can be time-consuming and prone to errors—a date calculator computes precise durations, leap years, and calendar adjustments instantly.

Key Features of Our Date Calculator

Our online date calculator comes with two powerful modes to suit all your calculation needs:

1. Find Days Between Two Dates (Duration Calculator)

This feature calculates the exact number of days between a starting date and an end date.

Include End Day Option: Includes an extra day in the total count if you want to count both the start and end dates completely (e.g., for work shifts or hotel stays).

2. Add to or Subtract from a Date

Need to know what date it will be 90 days from today? Or what date was 6 weeks ago?

Easily select a starting date.
Choose to Add (+) or Subtract (-) time.
Enter custom values for Years, Months, Weeks, and Days simultaneously.

How to Use the Date Calculator

Using our tool is straightforward and hassle-free:

To Calculate Days Between Two Dates:

Select your Start Date (Month, Day, Year).
Select your End Date (Month, Day, Year).
Check "Include End Day" if you wish to count the final day as a full day.
Click CALCULATE to view the total days.

To Add or Subtract Days/Months/Years:

Select your initial Start Date.
Choose either the Add + or Subtract - option.
Input the number of Years, Months, Weeks, or Days you want to calculate.
Click CALCULATE to get the exact future or past date.

Popular Uses for the Date Calculator

Our date calculator is helpful for various personal, academic, and professional scenario setups:

Project Management: Set accurate project milestones, sprint durations, and delivery deadlines.
Event Countdowns: Count down the exact days remaining until weddings, birthdays, anniversaries, or vacations.
Financial & Legal Planning: Calculate interest periods, contract durations, notice periods, and loan due dates.
Health & Fitness: Track pregnancy trimesters, fitness challenges, or medication schedules.
Age & Tenure Calculation: Find out your exact age in days or determine work tenure for resume building.

Frequently Asked Questions (FAQs)

Does this calculator consider leap years?

Yes! The calculator automatically accounts for leap years (including 29 days in February) to ensure 100% accurate results.

What does "Include End Day" mean?

By default, standard date math calculates the difference between two dates (excluding the final day). Checking "Include End Day" adds 1 additional day to include the last day in your total tally.