Online Date Calculator

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

Select Date
Choose First Date
Choose Second Date

About Date Calculator

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

This online tool is a one-stop destination for calculating the duration between two dates and it is also useful for adding or subtracting years, months, weeks, or days to or from a specific date. Also, our tool is free for all. Use it to check how much time is remain between two dates.

Online Date Calculator

How does it work?

The calculator will take the start date and end date from the users. As a result, it gives the duration between given dates in years, months, days, hours, and seconds. In addition, it takes the date and time (in years, months, weeks, and days) from users and gives addition or subtraction result.

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

Why use Online 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. Similarly, using this tool you can get the answer to how old am I. Calculating loan or rent payment dates can be done easily using the Date Calculator. It's also useful in business management and medicine schedule.

In addition, you can use our tool to add or subtract time from any date. 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 Add or Subtract Time 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 practice to perform addition and subtraction between date and time is 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.

Example 1:

Initial Date: November 9, 2021
Find out the 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, the final date would be: April 20, 2024

Day on that date is: Saturday

Example 2:

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


In this case, we need to subtract time 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, the final date would be: September 17, 2018

Day on that date is: Monday

How to find 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?
  • The business event will start on May 10, 2023. How many days remain from today?

These are the questions where you need to find the duration between two dates.

So, let's take an example.


Suppose, Start Date = September 23, 2021 and End Date = December 12, 2022
Find the 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

Features of Date Calculator

  • User Friendliness: The simple UI of our date calculator offers you a smooth and seamless experience. You just need to enter the date and time, 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 date duration and other date-related calculations. Also, you can perform add or subtract any date with a time frame. So, why stress your brain and calculate dates manually when you can do it with the help of our tool within a second.
  • 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 online and start using it. That's it!
  • Free to Use: The tool is completely free for all. No hidden charges or calculation limits.

How to use Date Calculator?

Open the on any device with an active internet connection. There are dedicated tabs for two different calculations. If you want to add or subtract time from a particular date, choose the first tab and follow the steps below.

  1. Firstly, fill in the date. Either you can enter the date manually or select it from the calendar. Also, you can fill in today's date by simply pressing the 'Today' button.
  2. Then choose whether to add or subtract from the drop-down list.
  3. Enter the time 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 result will be displayed below.
  5. You can reset and start from the beginning by using the 'Reset' button.

If you want to find the duration between two dates, go for the second tab and follow the instructions below.

  1. Firstly, fill in the Start Date and End Date. Here also you get the functionality of calendar to choose the date. And use the 'Today' button if you want to select today's date.
  2. After filling the date, just press the "Calculate" button.
  3. Finally, your output will be displayed with different time formats. Such as, years, months, days, hours, and seconds.
  4. For new calculations, you can press the "Reset" button.


Yes, our tool can work smoothly on any type of mobile device. Provided that it should have an active internet connection and browser support.

Yes, the our calculator can deal with future, present, or past dates.

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

Yes, we have built the tool considering leap years.