Days Between Dates
Days Between Dates Calculator
Find the exact number of calendar days between any two dates. Enter a start date and an end date to calculate elapsed days, check date ranges, and understand inclusive date counts.
Calculate Days Between Two Dates
How to Calculate the Number of Days Between Dates
Use the Days Between Dates Calculator to measure the length of a date range. It is useful for planning events, tracking project durations, checking deadlines, calculating travel periods, and finding how much time has passed between two dates.
- Select the beginning of the period in the Start date field.
- Select the ending date in the End date field.
- Select Calculate to display the number of days between the dates.
- Use Reset to clear the dates and start a new calculation.
Formula for Days Between Two Dates
The calculator finds the absolute difference between the two calendar dates and expresses that difference in days.
For example, the elapsed difference from 1 March to 8 March is 7 days. If you want to count both 1 March and 8 March as included calendar dates, the inclusive count is 8 days.
Worked Example
Start date: 10 April 2026
End date: 20 April 2026
Elapsed difference: 10 days
Inclusive count: 11 calendar dates
When Is a Days Between Dates Calculator Useful?
- Project planning: Estimate the number of calendar days available between milestones.
- Travel planning: Check the length of a trip or stay.
- Events and deadlines: Measure the time between an event date and a deadline.
- Personal planning: Count elapsed days between birthdays, appointments, and other important dates.
- Work schedules: Find a calendar-day span before using a working-days calculator for business-day counts.
Calendar Days vs. Working Days
Calendar days include every day of the week, including Saturdays and Sundays. Working days usually exclude weekends and may also exclude public holidays, depending on the calendar and rules being used. Use a working-days calculator when you need a business-day count rather than a simple calendar-day difference.
Frequently Asked Questions
How do I calculate the number of days between two dates?
Enter the start date and end date, then select Calculate. The result is the elapsed calendar-day difference between the two dates.
Does the calculation include the start date?
The standard date difference measures elapsed days and does not count both endpoints as included days. For an inclusive count of both dates, add 1 to the result.
What if the end date is earlier than the start date?
The calculator measures the absolute difference, so the number of days is returned as a positive value regardless of which date comes first.
Are weekends included in the result?
Yes. A calendar-day difference includes Saturdays and Sundays. It does not remove weekends or public holidays.
Does the calculator account for leap years?
Calendar date calculations account for the actual dates in the calendar, including 29 February in leap years.
What is the difference between calendar days and working days?
Calendar days include all days. Working days generally exclude weekends and may exclude public holidays according to the applicable work calendar.
Can I calculate the days between dates in different years?
Yes. Enter dates from different years to calculate the total elapsed calendar days across the date range.
Can I use this tool to count days until a future event?
Yes. Enter today's date as the start date and the future event date as the end date to find the number of days between them.
Why is my inclusive date count one day higher?
Inclusive counting includes both the first and last dates. The standard elapsed difference counts the number of days separating them, so the inclusive count is usually one higher.
Can this calculator count only weekdays?
No. This tool calculates calendar days. Use a working-days calculator when you need to exclude weekends and possibly public holidays.
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