Date Calculator

Date Calculator calculates the time duration or days between two dates. Also, you can add or subtract time duration from the date.

Select Date
Choose First Date
Choose Second Date

About Date Calculator

Have you ever been stuck while calculating days or time duration between two dates? No more! Get fast and accurate results with our Online Date Calculator. Here you can do the effortless time duration calculation at your fingertips.

Date Calculator - Time Duration Calculator, Days between Two Dates

This online tool is a one-stop destination for calculating the difference between two dates and it is also useful for performing basic calculations over dates. Like addition and subtraction between a given date and time frame.

Our tool is a free for all. Use it as a countdown for an event or any task. Even more, you can use it for adding or subtracting years, months, weeks, or days to or from a specific date. So, it's a very helpful and easy-to-use tool.

The time duration calculator will take the initial date and final date from the user side. As a result, it gives you the duration in years, months, days, hours, and seven seconds.

Also, this article will give you complete insights into the date calculation tool. From its usage and features to its working process. All the major things will be covered. Moreover, you will also learn the manual mathematics behind it.

So, let's start by understanding how does the Date Calculator actually works? In addition, we will explain the mathematical algorithm running behind the hood.

How to Add or Subtract Time Duration from Date?

I will start working on my physical fitness for the next 1 year. Today is 10th December 2021. What will be the date 1 year from today? What day will it be on that date?

What will be the date after 2 months and 3 weeks from today?

Questions like above are tricky to answer when the duration is long or complex.

These problems can be easily and quickly solved using our Date Calculator. However, let's try to understand the logic behind it.

The best rule to perform addition and subtraction between dates is that you need to add or subtract years with years, months with months, days with days, and so on. Start with years, months, weeks, and finally days. Most importantly, each result should be calculated separately then append to the initial date.

So, let's take some examples to understand it deeply.

Example 1:

Initial Date: November 9, 2021
Calculate the final date after 2 years, 5 months, 1 Week, and 4 Days


November 9, 2021 + 2 years = November 9, 2023
November 9, 2023 + 5 months = April 9, 2024
April 9, 2024 + 1 Week = April 16, 2024
April 16, 2024 + 4 Days = April 20, 2024

So, Final Date: April 20, 2024
Day on that date: Saturday

Example 2:

Initial Date: January 2, 2019
Calculate the final date before 3 months, 2 weeks and 1 Day.


In this case, we have to subtract time duration from a given date.
January 2, 2019 – 3 months = October 2, 2018
October 2, 2018 – 2 weeks = September 18, 2018
September 18, 2018 – 1 Day = September 17, 2018

So, Final Date: September 17, 2018
Day on that date: Monday

How to find Time Duration between Two Dates?

Today is December 12, 2021 and my exams start from March 18, 2022. How much time do I have for the preparation?

This is the question where you need to find the time duration between two dates.

Let's take an example.


Start Date: September 23, 2021
End Date: December 12, 2022
Find the time duration between these two dates.


So, when we place the above values in the calculator, we get 1 Year, 2 Months, and 18 Days.
In addition, we get:
Total Days = 445
Total Hours = 10680
and Total Seconds = 38448000

Time Duration Calculator is the best, fast, and easy way to get an accurate answer. The mathematical process behind the scenes is very complicated. Hence, Stick with our online date difference calculator to avoid mistakes.

Features of Date Calculator

The following are the most important features of our time duration calculator.

  • User Friendliness: The simple UI of our date calculator offers you a smooth and seamless experience. You just need to enter the dates, and press the 'Calculate' button. As a result, the answer will be displayed in an instant.
  • Multiple Operational Tool: Our tool meets all your needs for calculating time duration and other date-related calculations. Also, you can perform add or subtract any date with a time frame. In addition, you can find the time difference between the two given dates. So, why stress your brain and calculate dates manually when you can do it with the help of our tool within seconds.
  • Speed and Accuracy: To err is human. But our tool is 100% accurate as well as fast.
  • No Prerequisites: To use our tool you don't need to log in, sign up or even install anything. You just need to open the tool and start using it. That's it!
  • Free: The tool is completely free for all. No hidden charges or anything.

Why use Date Calculator?

Our tool can prove to be very beneficial for many use cases. From personal calculations to business needs.

For example, you need to determine the remaining days before your exam starts. So, you can enter today's date and the exam date to get the time remaining. Calculating EMI or rent payment dates can be done using the Date Calculator. It is also useful in business management and medicine schedule.

In addition, you can use our tool to add or subtract any two dates and calculate the time duration between any two particular dates. We know how mind-numbing calculations can be, particularly date and time calculations. Our tool does all the calculations necessary to obtain accurate and quick results. So, it saves you not only time but also workload.

How to use Date Calculator?

Open our tool on any device with an active internet connection. There are dedicated tabs for Date Calculation and Time Duration Calculation. If you want to add or subtract from a particular date, choose the first tab and follow the steps below.

  1. Firstly, fill in the date. You can either enter the date manually or select it from the calendar. Also, you can fill in today's date by simply using the 'Today' button.
  2. Then choose whether to add or subtract from the drop-down list.
  3. Enter the time duration in the specified format in years, months, weeks, and days.
  4. After all these things are done, press the 'Calculate' button. The output or final date will be shown below.
  5. You can reset and start from the beginning by using the 'Reset' button.

How to use the Time Duration Calculator?

If you want to find the time difference between two dates then go for the second tab. It will calculate the time duration or days between two dates.

  1. Firstly, fill in the Start Date and End Date. Here also you get the functionality of Calendar to choose the date and Today button.
  2. After filling, just press the "Calculate" button.
  3. Finally, your output will be displayed below in different formats. Such as, Years, Months, Days, Hours, and Seconds.
  4. For new calculations, you can use the "Reset" button.


Yes, the date calculator can be used on any type of mobile device. Provided that it should have an active internet connection and browser support.

Yes, the Time Duration Calculator can deal with future, present, or past dates.

For that, you need to calculate the duration between your birthdate and today's date. Choose the "Time Duration between Two Dates" tab and fill in the values. As a result, it will show you the days passed after your birth.

Yes, we have built the tool considering leap years.

We follow the Coordinated Universal Time (UTC) for the date and time calculation.


That was all about the Free Online Date Calculator. One of the most useful tools you can get. Built with fast and optimized algorithms for quick results for making your date calculations easy and fast.