Date Difference Calculator

Choose the start date: Select the date from which you want to begin counting.

Choose the end date: Select the date you want to compare it with.

Review the results: The calculator updates the calendar breakdown, total days, weeks, business days, weekend days, and hours.

Choose inclusive counting if needed: Enable the option to include the end date in the day-based totals.

Copy your summary: Use the copy option to save or share the calculated results.

Reset the dates: Clear the current selection when you want to calculate another date range.

The calculator requires a valid date range. An end date earlier than the start date is not accepted.

Find out how much time separates two dates with this free Date Difference Calculator. Choose a start date and an end date to calculate the difference in calendar years, months, and days, as well as total days, weeks, business days, weekend days, and hours.

The results update as you change either date. You can also choose whether to include the end date in the day count, then copy a summary of your results.

Whether you are planning a project, preparing for a trip, checking a contract period, counting down to an event, or tracking a deadline, this tool makes it easier to compare dates.

The calculator provides two ways to understand the time between dates: a calendar breakdown and a set of total time measurements.

Calendar years, months, and days

This breakdown expresses the difference using calendar units rather than converting everything into a fixed number of days.

For example, the difference between January 1 and March 1, 2024 is 2 calendar months. It is also 60 elapsed days because 2024 is a leap year.

Calendar months have different lengths, so a month should not be treated as a fixed number of days.

Total calendar days

Calendar days are all the days in the date range, including weekdays and weekends. By default, the calculator excludes the end date when counting elapsed days.

For example, the period from February 10 to February 20 contains 10 elapsed calendar days.

Weeks and remaining days

The calculator also expresses the total day count as complete weeks and remaining days.

For example, 10 days equals 1 week and 3 days.

Business days

Business days are counted as Monday through Friday. Saturdays and Sundays are excluded.

This calculator does not remove public holidays, national holidays, or company-specific days off. Its business-day result is therefore a weekday count, not a complete working-day calendar.

Weekend days

Weekend days are Saturdays and Sundays within the selected date range. They are included in the calendar-day total but excluded from the business-day count.

Total hours

The total hours are calculated by multiplying the elapsed calendar-day count by 24.

For example, 10 days equals 240 hours. This is a date-based estimate, not an exact measurement between two times in different time zones or across daylight-saving changes.

The choice depends on what you are measuring.

Exclude the end date when you want the elapsed time between two dates. For example, from February 10 to February 20 is 10 elapsed days.

Include the end date when you want to count every calendar date in the range, including both the start and end dates. The same period then contains 11 counted dates.

This distinction is useful when counting event days, travel dates, booking periods, or deadlines. Check which convention applies to the situation you are calculating.

Consider a date range from Monday, February 10, 2025 to Thursday, February 20, 2025.

The calendar breakdown describes the difference between the two dates. The inclusive option changes the day-based totals by adding the end date.

Project planning: Estimate the time between a project start date and a target completion date.

Travel planning: Count the days between departure and return dates.

Contracts: Check the length of a contract period or the time remaining before a specified date.

Event countdowns: Find how many days remain until a wedding, meeting, holiday, or other event.

Deadline tracking: Measure the time between an assignment date and its due date.

Personal planning: Calculate the time between important dates or milestones.

This calculator works with calendar dates. It does not account for local public holidays, company working schedules, or individual days off when counting business days.

It also does not use a specific time of day or time zone. The total-hours figure is calculated using 24 hours per counted day. Actual elapsed hours can differ when a period crosses a daylight-saving time change or involves different time zones.

For official deadlines, employment calculations, contracts, or travel arrangements, check the applicable local rules and calendar conventions.