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time Calculator

Time Calculator


Use this calculator to "add" or "subtract" two different time values. If you leave the input field blank, it will be considered as "0" by default.










Add the values to calculate hours, minutes, and seconds between two different times.

Start Time:

End Time:

This calculator lets you "add" or "subtract" time for (days, hours, minutes, and seconds) from a given starting time and date.

Start Date & Time







This calculator lets you calculate the number of days, hours, minutes, and seconds between the times on two different dates.

Start Date & Time


End Date & Time



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An online time calculator tells how many seconds, minutes, hours, days, months, and years are present in duration among any two times or two dates. This time finder calculator has the ability to add or minus the given hours, present minutes, and seconds as well. Moreover, it works as a date interval calculator as it calculates:

  • Total number of days
  • Total present hours between two given dates
  • Total number of minutes
  • Total seconds

Remember that the total time duration between any two events is known as elapse. For convenience, use elapse time calculator to compute the time among two events such as time duration between sunset and sunrise.

Also, you can try this online date calculator to calculate the date difference (number of days) or business days between two given dates.

About Time and Date:

Time can be defined as the unlimited and constant progress of events that takes place in an irreversible manner whereas the date can be defined as the day of any month or any year that is represented by any specific number.

Time According To Ancient Greece:

There are many different concepts about time in history. Famous philosopher Aristotle explained the time as “a number of movement in respect of the before and after.” According to him time was endless and nonstop or constant.

Time According To Newton And Leibniz:

Newton considered the time as a complete measure. He believed that times flows by its own without the help of any external force. Opposite to the Newton, Leibniz explained the time as a phenomenon in the existence of things or items with which it can make contact and interact.

There are so many concepts about time and time calculation in history that are based on different theories but still time in not completely understood. In old times calendars or glass hours were used for measuring it but in this world of technology we can easily measure the time by using any sort of time duration calculator-f whereas f represents the frequency of the time.

Worldwide Representation of The Date:

It is the combination of day, month and year in the whole world. For example, in case of 9 June 2020:

  • 9 = day
  • June = month
  • 2020 = year.

Internationally total time between two dates always will be equal to 24 hours. You can easily find the present year, month, week, and day among dates along with the calculation of time with the assistance of time counter.

Concepts of Time and Date (Evidence-Based):

Hipparchus was the first person who made contributions in the development of time concept. He made a system that was consist on longitude lines. These lines were about 360 degrees and every degree was further divided into 60 fragments. These 60 parts were further divided into smaller 60 parts again. These division of parts now identified as as the minute and second.

There are some more basic concepts about time and date that helps us to understand it with evidence.

UTC or Universal Coordinated Time:

It is also as Greenwich Mean Time that is usually abbreviated as GTM. It is the basis for current representation of the time. Furthermore, it is a basic procedure to convert the time into other formats.

Field-Based Time Concept:

This concept explains the time by dividing the date/or time into unconnected factors that could be a specific year, present month, current day, current hour, minute, second, etc. for example 2017-08-10T06:10:32.

Incremental Time Concept:

This concept is used to represent the time in computers. It is based on any fixed number that increases gradually.

Floating Time Concept:

This concept came out to represent a nominal time. It is defined in the same manner all over the world. Take the example of 90th birthday of British queen that was on Saturday 11 June 2016. The time when her birthday starts were 11th June that starts or ends differently in the altered countries because the clock of every country is set contrarily. On the other hand, no matter in any region how many hours are left to reach that date, birthday will always be on 11 June. Such value is known as floating time.

Time Zone Concept:

This concept is usually used to represent the local time of any specific region. A time calculator-f measure the time in any region of the world with ease following the concept of time zone as well. Furthermore, a specific time between two times durations can also be measured with the assistance of such equipment.

Earlier Concepts To Measure The Time:

In ancient times there was no specific or standardized system to measure the time. Every region had its own way to calcite their hours. Some of the methods were:

  • Oil lamps
  • Candle clocks
  • Water clocks or clepsydra

In year 2956, Christiaan Huygens developed a first pendulum mechanical clock. In these days’ atomic clocks are being used.

Date Development-An Evidence-Based Study:

Civilization of Egypt is considered as a first civilization that uses the concept of date. They divided the whole day into small parts for calculating time. They introduce the concept of sundials to measure these smaller chunks according to evidence. From sunrise to sunset the whole duration was divided into 12 parts. In the same way the duration from sunset to sunrise was also divided into more 12 parts by Egyptian astronomers. It is also known as time elapsed. This division provided the basis of 24 hours. Therefore, one date consists on total 24 hour or in simple words we can say that the difference hours to days date duration is 24 hours.

Gregorian And Some Calendars:

In year 1582 Pope Gregory XIII developed a Gregorian calendar that is used in all over the world. The basic purpose of this calendar is to represent the civil time. it is usually known as solar calendar as well that has total 365 days in one year. In case of leap four extra days are also added as well. Any time difference calculator usually follows the Gregorian calendar in its calculation. some other calendars are:

  • Lunar calendars
  • Some calendars have different dates to start than the Gregorian calendar
  • Some reset calendars that changes the dates whenever an important person dies.
  • Religious calendrers

For all above mentioned calendars date duration and difference between dates are 24 hours in every region of the world.

HTML5 Date and Time Concept:

In the following, there are some examples of its representation.

Global Date and Time:

It includes:

  • A 6-digit date
  • T or space
  • A 4-9-digit time that is required
  • A required Time-zone offset that is Z or +/-2 digits along with non-compulsory representation of seconds. For example, 2017-04-25T21:18:46.123+07. To calculate time between dates we usually take the difference among any two global dates.

Concept of Normalized Global Date:

It follows the same concept as above. In normalize global date an additional term T is required and 00 is absent in the seconds. Furthermore, in this concept the time-zone offset will only be Z., for example, it will be written as 2014-03-25T21:16:45.123Z.

How To Add or Subtract Two Different Times?

For adding two different times you can take help from time calculator or follow below simple steps to have an outcome time between times:

  • First of all, add the given hours.
  • Now add the given minutes.
  • If the given minutes are 60 or more then 60, then you have to minus 60 from the given total minutes and then add 1 to total given hours. For example:
  • One Time: 2:45
  • Second time: 1:10
  • 2:45 + 1:10
  • Now we will add the hours: 2=1 = 3
  • Now we will add minutes: 45+10 = 55
  • Answer: 3:55

For subtracting two different times you can take help from calculator for time or follow below simple steps to have an outcome:

  • First of all, minus the given hours.
  • In the second step we will minus the given minutes.
  • If the given minutes are present with a negative sign, then we will add 60 to them and minus 1 from given hours. For example:
  1. One time: 4:10
  2. Second time: 1:05
  3. 4:10 – 1:05
  4. We will minus the Hours: 4−1 = 3, now we will minus the Minutes: 10−5 = 5
  5. Answer: 3:05

How To Calculate Time Duration between Two times?

Whenever you want to calculate the time difference among two times of day keep in mind that it will depend on a number of minutes and seconds of two comparable times. The time counter is the best solution for this calculation but for a manual solution, the following are some simple steps.

First of all, you have to select the starting time as one time and an ending time as the second time. Now you can minus the starting time from ending time to have the total duration between them. There is a certain set of rules that will be applicable:

  • You need 24-hour time format in order to make calculation. For example, while dealing with 1:00 PM you will write it as 13:00 by following 24-hour time format.
  • Now find out the greater number of minutes in tow comparable times.
  • If the greater number of minutes are present in the ending time, then you have to minus the starting time from ending time in order to have time between two times. For example: 13: 57 – 9: 22 = 4: 35. In this example:
  1. Starting time: 9:22
  2. Ending time: 13:57
  3. Time duration: 4:35
  • If we have greater number of minutes in the starting time, then we will handle hours and minutes independently. We will Add 60 to the total number of minutes of our ending time. in the next step we will minus one hour from hour portion. Now finally we have to minus minutes and the hours and we will keep the outcomes on the suitable side of the “:”. Wherever total hours are present on the left, and total minutes are present on the right. However, a minute calculator will do such calculations for you with ease. Have a look on the following example in case of manual calculation.
  1. 13:57 – 9:58 = 12:117 – 9:58 = 3:59.


  • Starting hour: 5am
  • Starting minutes: 10
  • Starting seconds: 50
  • Ending hour: 3am
  • Ending minutes: 15
  • Ending seconds: 20

Now we will subtract ending hours from starting hours,ending minutes from starting minutes, and ending seconds from starting seconds to have our required result in 12-hour format.

Answer: Difference between 5am to 3am will be 22 Hours, 4 Minutes, 30 Seconds. To clear your confusion, you can take help from minute calculator for verification and confirmation of results.

How To Calculate Time With This Time Calculator?

Time duration calculator is functioned to:

  • Calculate total hours between two times i.e. calculate duration
  • Find out how much time between two or more days?
  • Calculate time from date
  • Count days
  • Add days
  • Calculate date and time together.

To Calculate Time:

To calculate time from one day to another or on the same day just follow the below steps.


  • Select time from drop down menu
  • Enter starting day, hour, minutes and seconds
  • Now choose add or subtract from the given option
  • Now enter the end day, hour, minutes and seconds
  • Click the calculate button


  • You will have total time in terms of days, hours, minutes and seconds

For another calculation click the re-calculate button of this time duration calculator.

To Calculate Time Duration:

Elapse represents the time duration between two events that can be calculated with the help of time elapsed calculator as follows.


  • Select time duration from the drop down menu
  • Select time format from the given options i.e. 12 hours or 24 hours
  • Now in the next step Enter total hours, total minutes and total seconds of start time
  • Enter hours, minutes and seconds of end time
  • Click the calculate button


  • Time duration will be given in hours, minutes and seconds

To Calculate Time From Date:

Time form or within specific date can be calculated with the help of date time calculator with ease as follows by a simple step by step procedure.


  • First of all, you have to Select “time from date” option from the given menu of this time duration calculator .
  • Select the time format from the given options. i.e.12 hours or 24 hours.
  • Now click on “start date and time”. A colander will be given and you just have to clock the starting date to add it.
  • Enter hours, minutes and seconds in am or pm from present day.
  • Select add or subtract according to your requirement from the given option
  • Enter days, hours minutes and seconds
  • Click the calculate button


  • Staring day date and time will given
  • Added days, date and time will given
  • Resulted days, date and time will be given altogether

To Count Days:

To calculate days between two dates, select “count days” and follow the simple steps below.


  • Enter the start end
  • Enter the end date
  • Click the calculate button


  • Total number of weeks, days, hours, minutes and seconds will be given.

To Calculate Total Days:

Select “total days” from drop-down menu. Below are given some simple steps to make calculation.


  • Enter the start date
  • Select add or subtract from the given option according to your requirement
  • Enter years, months, weeks and days
  • Click the calculate button


  • You will have start date.
  • Subtracted or added years, months, weeks and days.

To Calculate Date And Time:

Select time & date option form the menu and follow the below step.


  • First of all, select the time format from the drop-down menu i.e. 12 hours or 24 hours
  • Enter the start date
  • Enter the starting hours, minutes and seconds
  • Enter your end date.
  • Enter ending hours, minutes and seconds
  • Click the calculate button


  • This day duration calculator provides you with the time and date in terms of weeks, days, hours, minutes and seconds among starting and ending time and date


What’s 7 hours from now?

You can easily find out time from now with this time duration calculator. and, if you want to calculate it manually, then you just have to follow the simple calculation method.

  • Write down the ending time along with hours, minutes and seconds.
  • Write down the starting time along with hours, minutes and seconds
  • Now to find the difference by subtracting starting time from the ending time to have the present time.

How do you calculate minutes?

To calculate minutes, we have to divide the total number of given seconds by 60. In this way seconds will be converted into minutes. Now we will add these obtained minutes into total minutes. Results of addition will be divided by 60 to convert it into hours.

What time will it be in 45 minutes?

Time duration of 45 minutes from now can be calculated by applying the following rule:

  • Two hours = 2 hours * (1 hour/ 1 hour) = 2 hours.
  • Same rule will be applied on 45 minutes
  • Forty- five min is 45 min multiplied by (1 hour and then divided by 60 minutes = 45/60 hours = 0.75 hr.

Also, you can readily calculate the time difference between two times with the ease of elapsed time calculator.

How do you calculate hours and minutes?

There are two methods to make this calculation.

  • Use of any online time to time calculator
  • Manual calculations.

If you are using any time calculator, you have to follow its commands to have the answer without any error. For manual calculations you have to follow some simple steps that are explained below:

  1. First of all, you have to divide the give minutes by 60.
  2. If you get the result in a decimal number then hour is the integer part of that number.
  3. Decimal part will represent the minutes that are multiplied by 60.

How do you calculate elapsed time between two dates?

Elapsed time between dates can be calculated by a formula or with the help of elapsed time calculator. calculator will give you commands that you gave to follow to have your results. In the manual calculation you have to follow a simple formula. All you have to do is putting the dates in following formula:

  • Formula = B2-A2,
  • A2 represents the starting date
  • B2represents the ending date

What is duration of time?

Duration represent the length of something or a time interval before a thing end. If you want to measure such duration, there are many rules and methods for this purpose. The most common thing is the date and time duration calculator that calculates duration time.


This time duration calculator is intended to deliver a general estimate about time duration in different scenarios. For financial purposes no one should completely relied upon this calculator. It is designed for educational and learning purposes.


From Wikipedia, the free encyclopedia – Time Definition – units, and much more!

From the source of study – Chapter 23 / Lesson 17 – Transcript | Additional Activities – What is Elapsed Time – Definition & Examples.

From the source of – How Many Days Left in 2020 – Days Until Christmas – Days Until New Years

From the source of wikihow – Co-authored by Klare Heston, LCSW (Clinical Social Worker) – Recently updated References Approved – How to Manage Your Time


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