Days Between Dates Calculator

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Calculate the exact number of days, months and years between two dates. Perhaps you want to find out exactly how old you are in days or the day on which you were born (you could try my birthday calculator for this). Or, maybe you're looking to calculate the number of days until you retire. Whatever the reason, this calculator can help.



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Whilst every effort has been made in building this days between dates calculator, we are not to be held liable for any special, incidental, indirect or consequential damages or monetary losses of any kind arising out of or in connection with the use of the converter tools and information derived from the web site. This days between dates calculator is here purely as a service to you, please use it at your own risk. Do not use calculations for anything where loss of life, money, property, etc could result from inaccurate conversions.

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Calculating days between two dates

Working out the number of days between two dates can be a tricky calculation. To begin with, there's the obvious consideration of the different number of days in each month. We know that there's 365 days in a regular year. If there's a leap year involved then an extra day is added. A leap year occurs every 4 years and means that February has 29 days instead of 28.

Then we get into months and the mnemonic to help remember the number of days in each:

"Thirty days have September, April, June, and November. February has 28 alone (or 29 in a leap year), And all the rest have 31."

The calculator on this page works by getting the time stamp of the start date and deducting it from the end date (or vice-versa if the end date is in the past) before calculating the number of days, months and years between them.

How many days since I was born?

Calendar with birthday on it

To calculate the number of days since you were born, use the calculator at the top of this page. Simply enter your date of birth as the start date and then ensure that the end date is set to today's date (if it isn't already set, click the 'today' link that appears to the right of the box). Then click the 'Calculate' button. In a world where privacy of personal data is hugely important, please rest assured that I do not store any of the information you enter into my calculator.

On what day was I born?

As well as telling you how many days you've been on our planet, my calculator is also able to work out what day you were born on. As an alternative, you could try the birthday calculator, which will show you all sorts of fun facts about your birthday, including the day on which you were born.

How many days since...?

Take a look at our article showing how many days there have been since some of the most important events in world history took place.

If you have any problems using this calculator tool, please contact me.