Time Calculator

Time calculator allows you to add or subtract two time values. In addition, you can find the time duration between two times.

+Add       -Subtract

About Time Calculator

Time Calculator Online

First of all, let's discuss something about our time calculating web application. In this section, we will cover these topics:

  • Basic introduction
  • How does it work?
  • Why we made it?

Time Calculator is used to easily add or subtract two provided times. It makes finding the duration between two times super simple. Just fill the respective boxes as per your requirements and hit the "Calculate" button.

Time and Tide Waits for None

How many times have you heard this term? So many times right? Even more, we believe that it is the most accurate and certitude line. In the future, we might be able to halt the tides with the use of advanced technologies. But, we can never do the same for time. It's impossible! Because we all know that there is no human control on time.

Time is a thing that in reality doesn't exist. But it directly or indirectly impacts our routine work cycle. Also, we can't actually stop or holt time in real life. But we can utilize it efficiently to make our life more beautiful and valuable. That's why we made this Time Calculator. So, you can use it and calculate the duration between two times and manage your daily work plans properly. It's a very useful and productive application for all.

How to Add or Subtract Clock Time?

It's very simple. Let's take an example to understand it.

Example: Add Time

Let's add 2 hours, 45 minutes, and 30 seconds with 3 hours, 50 minutes, and 20 seconds.

The addition will perform like this:

Add Time

Therefore, the final output after the addition is: 6 hours, 35 minutes, and 50 seconds.

Example: Subtract Time

Now let's subtract 3 hours, 50 minutes, and 30 seconds with 2 hours, 30 minutes, and 20 seconds.

You can see the time subtraction calculation below:

Subtract Time

After subscription, we get 1 hour, 20 minutes, and 10 seconds.

How to use Time Calculator?

As you can see, the user interface of this tool is very simple. So, anyone can use it very smoothly. Read this small tutorial so that you don't encounter any problem during time calculation. Also, you don't end up getting incorrect results.

Firstly, you would require an Internet connection and a device to access it. Then open the time calculator in your device.

At the top of the page, you can see a simple form. Don't be confused to see so many boxes. Just keep reading it and follow the instructions.

We have divided the process into three simple steps to make it easy to understand.

  1. Enter the time values.
  2. Select operation "Addition" or "Subtraction".
  3. Calculate time and get results.

Let's understand above all steps in detail one by one.

1. Enter the Time Values

So, first of all, we need to enter the time values as per the requirements. Most importantly, you need to follow the proper format to enter values. Because if you are not entering the values in the right format then you will not get the true result..

The format you need to follow is: (YYYY/MM/DD - hh/mm/ss)

  • YYYY - Years
  • MM - Months
  • DD - Days
  • hh - Hours
  • mm - Minutes
  • ss - Seconds

Don't worry you can easily enter values because we have added the heading above all the input boxes. So, you can easily know what you need to enter..

Enter Values

Also, it's not compulsorily required to enter all the values. You can enter any values as you need. For example, if you want to add/subtract only hours and minutes then you can enter only Hours and Minutes. No need to enter Years, Months, Days, and Seconds values..

2. Select Operation "Addition" or "Subtraction"

The second step is to select the operation. If you want to add time then you can choose the "Addition". Similarly, if you want to subtract time then you can select "Subtraction".

Time Calculator Operation - Addition/Subtraction
3. Calculate Time and Get Results

At the last click on the "Calculate" button. As a result, you will get the final output below in less than a second. Also, you can use the "Reset" button to refresh the calculator.


That's it!

Features of Time Calculator

This small and simple tool can provide you so many benefits you can never think of.

  • Time is the most important asset for us. Managing time is the greatest skill. Using our tool, you can polish your time management skill.
  • Calculating time duration made simpler. The process hardly takes a few seconds. Whereas, the manual calculation is very complicated and waste our time too.
  • Along with the speed it's 100% accurate. Fill in the details correctly and the results will never be incorrect.
  • The Time Duration Calculator supports cross-platform. Therefore, you can use it on your mobile and iPad too. Also, you can use it in any browsers like Chrome, Safari, Firefox, ect.
  • It's lightweight and easy to use. There's no rocket science behind using the tool. Very simple three steps process that you need to follow.

Amazing History of Time

So, what's the time now? Probably you have looked on the bottom right side of the taskbar or maybe top of your phone's display. Today, we can see the current time in less than a second. We have clocks, watches, mobiles to see the time accurately and rapidly.

But think about ancient people. How did they keep track of time? Also, they didn't have anything like the Internet or mobile/computer. Unluckily they couldn't take advantage of the Time Calculator app. As today, we are using time and it's units almost all day and night. It was not the same case in the ancient period. In that era, people were curious about time. They wanted to unfold every mystery regarding it. There are many stories in which people tried to freeze time or time travel. Sadly, all efforts went to vain.

The most successful thing which we achieved was measuring time. The standard units to measure time are Days, Hours, Minutes, and Seconds. From then to now, we are using the 24 hours a day concept. Because a day consists of 24 hours. Also, 1 hour contains 60 minutes and 1 minute is equal to 60 seconds.

In addition, Years and months are using to measure long distances.

Time Unit Table

The following table shows the most common time units and their durations.

millennium1,000 years
century100 years
decade10 years
year (average)365.242 days or 12 months
common year365 days or 12 months
leap year366 days or 12 months
quarter3 months
month28-31 days
January, March, May, July, August. October, December - 31 days
April, June, September, November - 30 days.
February - 29 days for leap year and 28 days for common year
week7 days
day24 hours or 1,440 minutes or 86,400 seconds
hour60 minutes or 3,600 seconds
minute60 seconds
secondbase unit
millisecond10-3 second
microsecond10-6 second
nanosecond10-9 second
picosecond10-12 second

SI Unit of Time

The SI unit of time is Second. Also, we can call it a base unit of time. We can easily observe second and count it. There are some more units of time. For example, milliseconds, microseconds, nanoseconds which are smaller than the second. We also have bigger units like minutes, hours, days, weeks, months, years.

The time calculator tool allows you to enter the time in seconds, minutes, hours, days, months, and years. As these are the easily observable units.

Nature as a Clock

Ancient people took the help of nature to know the current time. Most importantly, they used Sun as the main factor. Accordingly, they divided the day into twelve parts. Starting from sunrise to sunset. But, this method was not so effective. Because on cloudy days they can not see the Sun properly. Therefore, they can't assume the exact time.

Hourglass - Time Calculation


In the search of weather independent time tracking method, ancient people came up with the idea of Hourglass. It is also known as Sandglass. The Hourglass or Sandglass has two parts. One above and one below. The upside part is filled with sand. Between upside and downside parts, there is a very small hole. So, that sand from the above part can fall into the below part. After some time all the sand is transferred to the below part. In some hourglasses, there is an option to manage hole size. So, we can reduce the flow of sand falling and increase or decrease the time duration.

To start counting time using hourglass, we need to keep the sand-filled part upside. Therefore, we can use it and measure time intervals. It's one type of timer. But, it was used to measure small durations only. Like 1 or 2 hours. Therefore, it was not the best way to measure time. After some time, more advancements were made. Consequently, more timekeeping devices were invented like a Water clock, candle clock, etc.


Using Time Calculator, you can easily calculate the duration between two times. Fill the times(hours, minutes, seconds) in respective fields. Select Subtract and then "Calculate".

Just enter the values in empty fields and select the "Add" operation and calculate.

No, you can enter any values as per your need. For example, if you want to subtract or add only years then you need to enter only year values. No need to fill the others.

For a new calculation press the "Reset" button.

Yes, it is 100% free to use. Use it anytime anywhere for free. No subscription or calculation limits.


Overall we can say that the Time Calculator is the best online time calculating tool to find the duration between two times. Also, you can perform addtion and subtraction operation in this application. It's easy to use, fast, and accurate.