Date Difference Calculator

Date Difference Calculator — Find the Time Between Two Dates

See how far apart two dates are in days, weeks, months, and years, along with the number of weekdays in between. Pick a start and an end date and the results update immediately.

How to Calculate the Difference Between Dates

Choose a start date and an end date. The main result is the number of days between them, with weeks, approximate months, approximate years, and weekdays listed underneath. The page opens with today and a date 30 days ahead. If the end date is earlier than the start date, the tool still shows the gap and adds a note that the end comes before the start.

Understanding the Results

Days are counted between the two dates, so 1 January to 31 December 2026 is 364 days. Weeks are the number of days divided by 7, shown to one decimal place — 52.0 in that example. Months and years are approximations: months divide the days by 30.44, the average length of a month, and years divide by 365.25, the average year including leap years. That gives 12.0 months and 1.00 years for the same range. Because calendar months vary from 28 to 31 days, these averages won't always match what you'd count on a calendar. The weekdays figure counts Monday to Friday and includes both the start and end dates. If you need a straightforward day count with the option to include the end date, the Days Between Dates tool does that.

Good Uses for This Tool

Measuring how long a project or a contract runs, checking how many days remain until a deadline, working out how old something is, planning trips, courses, and training programmes, and comparing the length of two time periods.

Is It Actually Private?

Yes. The dates are processed in your browser — they are never sent to a server or stored.