Date and Time / Free Tools
Free Days Between Dates Calculator Online
Use this free days between dates calculator to find out exactly how many days, weeks, months, and business days fall between two dates. It works as a general date difference calculator for deadlines, countdowns, and anniversaries, and includes a business days calculator option that excludes weekends - no sign-up required.
What is a days between dates calculator and why it matters
A days between dates calculator takes a start date and an end date and works out exactly how much time separates them - in total days, weeks, months, and business days. This matters because manually counting days on a calendar is slow and easy to get wrong, especially across month boundaries, leap years, or when weekends need to be excluded. A reliable date difference calculator is useful for tracking a project deadline, planning how many working days remain before an event, checking how old a document or milestone is, or simply counting down to something like a wedding, trip, or anniversary. It also removes the guesswork around inclusive versus exclusive counting - whether the start day and end day themselves should be counted - which is one of the most common sources of an off-by-one error when people try to count days by hand.
How this calculator works
This tool converts your start and end dates into a fixed point in time and calculates the exact number of days between them, avoiding time zone or daylight saving issues since only the calendar date is used. The years, months, and days breakdown is calendar-aware, meaning it accounts for different month lengths and leap years rather than using a flat 30-day-per-month estimate. Business days are calculated by counting every weekday (Monday through Friday) between the two dates and excluding Saturdays and Sundays, giving you a working-day total alongside the calendar-day total. The optional inclusive setting simply adds one extra day to the total when you want both the start date and end date counted as part of the span, rather than only the days strictly between them.
Common searches this calculator answers
- How many days are there between two dates?
- How many business or working days are left until a deadline?
- How many weeks are between today and a future date?
- How do I calculate the number of days including both the start and end date?
- How many days old is something based on its start date?
- How many days until a specific event or anniversary?
How to use it
- Enter the start date - this can be in the past or the future.
- Enter the end date you want to measure against.
- Check "Count both the start date and end date" if you want an inclusive count instead of the default exclusive count.
- Read the total days figure, plus the weeks, years/months/days, and business days breakdown below it.
- Use the swap button to quickly reverse the two dates if needed.
Tips
- Leave the inclusive option unchecked for a standard "days until" or "days since" count - most everyday uses expect this default.
- Check the inclusive option when counting something like a rental period or event that includes both the first and last day.
- Use the business days figure instead of total days when estimating how long a task will realistically take at work.
- The years, months, days breakdown is calendar-aware, so it is more accurate than dividing total days by 30 for the month count.
- Double-check the day of week shown for each date if you are confirming a deadline that must land on a weekday.
Frequently asked questions
Is this days between dates calculator free to use?
Yes. It is completely free, works in your browser, and does not require any sign-up or download.
Does it include or exclude the start and end date by default?
By default it counts the days between the two dates exclusively (a standard "days until" style count). Check the inclusive option if you want both the start date and end date counted.
How are business days calculated?
Business days are counted as Monday through Friday only, with Saturdays and Sundays excluded. Public holidays are not automatically excluded, since they vary by country and region.
Does this calculator account for leap years?
Yes. The calculation is based on actual calendar dates, so leap years and varying month lengths are automatically handled correctly.
Can I calculate days between a past date and a future date?
Yes. Either date can be in the past, present, or future - the calculator simply measures the distance between whichever two dates you enter.
Why does the years, months, days breakdown look different from dividing total days by 30?
Because months are not all the same length, dividing total days by a flat 30 gives an approximate figure. This calculator instead counts actual calendar months and years, which is more accurate.
Can I use this to count down to a wedding, trip, or deadline?
Yes. Set today as the start date and your target date as the end date to get the total days remaining, along with a business-days breakdown if the countdown involves work days.
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