Days Between Dates
Select two dates and calculate the time between them in days. See an overview in weeks, months and years and optionally count the end date as a full day.
Time Between Two Dates
The date format is based on your browser settings.
The end date must be on or after the start date.
Quick Date Facts
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All values are calculated based on today’s date in your local time zone.
How this days between dates calculator works
This calculator measures the time between two calendar dates. It shows the total number of days between the start date and the end date and also provides an overview in weeks, months and years. This is useful for planning projects, tracking time periods, or understanding durations in a more intuitive way.
Select a start date and an end date. The calculator determines how many days lie between these two points in time. If you want to treat the end date as a full day, enable the option to add one extra day to the total.
The date fields use the format provided by your browser and operating system, such as DD.MM.YYYY or MM/DD/YYYY. The result is independent of the displayed format and is based only on the calendar dates you select.
Examples of practical use
- Project duration: How many days did my project last from the start date to the end date?
- Deadlines: How many days are left until my deadline?
- Events and trips: How many days or weeks did my vacation or trip last?
- Contracts and rental periods: What is the exact length of a contract or rental period between two dates?
- Personal milestones: How many days are there between two important dates?
Related Calculators
If you work with dates regularly, you may also want to calculate how many days have passed since a specific day with our Days Since Date Calculator, add or subtract time from a date using the Add or Subtract Date Calculator, or check what weekday a date falls on with the Weekday Calculator. For time-only spans, the Time Duration Calculator is a helpful companion tool.
These tools are often used together for scheduling, planning, and understanding timelines across days, weeks, and months.
- How many days since my last vacation?
- How many days have passed since January 1st, 2020?
- Track days since starting a new job.
- What date is 30 days from today?
- Subtract 45 days from a deadline.
- Plan follow-up dates for appointments.
- What weekday is my meeting date?
- What day of the week was I born?
- Check weekdays for travel planning.
- What ISO week is today?
- Which week does a project start?
- Plan schedules using week numbers.
FAQ
How are the days between two dates calculated?
The calculator takes your start date and end date and counts the number of calendar days between them. By default, the start date is included and the end date is excluded.
What does “Count the end date as a full day” mean?
If you enable this option, 1 extra day is added. That means both the start date and the end date are treated as fully included in the count.
What does “Only count working days (Monday–Friday)” do?
When enabled, the calculator excludes Saturdays and Sundays and counts only weekdays (Monday through Friday).
Can I see the difference in weeks, months and years?
Yes. In addition to total days, the tool shows an overview in weeks, months and years so longer time spans are easier to interpret.
What happens if the end date is before the start date?
The calculator will show an error message and won’t return a result. The end date must be the same as or later than the start date.
Do I need to choose a date format manually?
No. The date picker uses your browser/region settings (for example DD.MM.YYYY or MM/DD/YYYY). The calculation uses the actual dates you select, independent of how they’re displayed.
Why do some websites show different day counts?
Different tools use different counting conventions (for example whether the end date is included by default). This calculator uses consistent Gregorian calendar rules (leap years and month lengths) and avoids time zone or daylight-saving issues by calculating based on calendar dates.