Date Calculator (Days Between Dates, Add or Subtract)

Find how many days lie between two dates, or add and subtract days, months and years.

Result

How to use Date Calculator (Days Between Dates, Add or Subtract)

Choose what to do: days between two dates, add to a date, subtract from a date or days from today.
Enter the dates and, for adding or subtracting, the years, months and days.
For days between, choose whether to count the end date as well.
Read the result with its weekday, and the same gap in weeks and days.

About this tool

Counting days between dates is subtraction on a calendar: the number of midnights you cross. From 1 January to 31 December 2024 is 365 days, because 2024 is a leap year with 366 days, and the gap is one less than the length of the year. Some uses, such as counting nights or inclusive deadlines, ask you to count the end date too, which adds one day.

Adding months works differently from adding days. Months have different lengths, so adding one month to 31 January gives the last day of February, 28 or 29, not a date in March. In add mode the calculator applies years and months first and then the days, so the order is always the same.

The days-from-today mode starts from your device's date, so the answer is for the day you open the page. Business days, holidays and time of day are not included.

How it is calculated

Days between = the difference of the two dates counted in whole days. Add one to include the end date.

Adding months moves the calendar month and keeps the day of the month where it exists. If it does not exist, the last day of that month is used.

Worked examples

From 1 January 2024 to 31 December 2024 there are 365 days, which is 52 weeks and 1 day.
One month after 31 January 2024 is 2024-02-29, a Thursday, because February 2024 has 29 days.
60 days after 1 March 2024 is 2024-04-30, a Tuesday.

Tips for better results

Check whether your deadline counts the first day, the last day, or both, and tick the box to match.
To plan in weeks, use the weeks and days line under the result.
For ages, use the Age Calculator, which gives years, months and days.

Frequently asked questions

How many days between two dates?

Enter both dates in days-between mode. The result is the number of days from the earlier date to the later one.

Is the end date counted?

Not by default. Choose to count it if you want both the first and last day included.

What is 90 days from today?

Use the days from today mode, enter 90 and choose days after today.

Does it skip weekends or holidays?

No. It counts every calendar day.

Are my numbers saved or sent anywhere?

No. The calculation runs in your browser on your own device. Nothing you type is sent to Paul Digital or any other server.

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Privacy

The calculation runs in your browser on your own device. The numbers you type are not sent to Paul Digital or any other server. Results are estimates from the numbers you enter and are not financial, tax or legal advice.