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Day Counter

Created by Bogna Szyk and Rita Rain
Reviewed by Małgorzata Koperska, MD and Jack Bowater
Last updated: Jan 18, 2024

The day counter, otherwise known as a date-to-date calculator, is a handy tool that lets you estimate the number of days between dates quickly and without any hassle. For example, you can use it when counting down to your birthday (we also have a birthday calculator 🎂) or when you're wondering how many days are left before a critical deadline.

That's not all, though! You can also use this date duration calculator to check what date it will be after a certain number of days have elapsed – for instance, if you're starting a 90-day fitness challenge, you can find out when the challenge will end.

💡 You might also be interested in our date calculator and the business days calculator.

How to use the days calculator

There are three main ways you can use this date-to-date calculator:

  1. Unknown number of days between dates – If you know the start and end date (for example, of the summer holidays), you can quickly count the days between them. All you need to do is input these two dates into the day counter. Remember that the end date should be after the starting date – after all, you can't go back in time!

  2. Unknown start date – To find out what date it was 57 days ago, input the end date and the number of days elapsed into their respective fields.

  3. Unknown end date – You can also use this calculator to find out what day it will be after a specific amount of time has elapsed. To do that, input the starting date and the number of days between into the day counter.

How many days between dates?

Imagine that you have a complicated project due at work. Today is July 14. Your boss wants to check the progress 14 days before the end of the project. Additionally, he expects the project to be finished by September 27.

You can ask yourself two questions:

  • On what date will the progress check take place?

  • How many days do you have until the progress check?

To answer the first question, we need to subtract 14 days from the date of September 27. If you input 14 days as the days between and September 27 as the end date into the day counter, you will quickly discover that the progress check will take place on September 13.

Now that we know when the progress check will happen, we can calculate the number of days between July 14 (the start date) and September 13 (the end date). The result is 61 days – that's the amount of time you have left to work on your project.

Not sure whether the result is correct? Go ahead and check it with the date duration calculator!

You can also find the number of business days between the two dates, which will be how many days you need to work!


Does Saturday count as a business day?

No, Saturday does not usually count as a business day. This is because Saturday is the Jewish Shabbat, or day of rest, which was taken as a holiday along with the Christian Sabbath to form the weekend.

How do I count days?

To count days:

  1. Assign each day of the week a value between 1 and 7.

  2. If your days occur within the same week, subtract the earlier date from the later date.

  3. If your days occur in different weeks, add 7 to the later date for each week of difference, and then do the same subtraction.

Do holidays count as business days?

No, national public holidays or bank holidays do not count as business days as no one is supposed to work on those days. If you are taking a personal holiday, but the rest of your country is still at work, then your days off do count as business days.

How do I count 5 working days?

To count five working days, count forward five days, ignoring any weekends or public holidays that you may land on.

Bogna Szyk and Rita Rain
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