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Date Difference Calculator

Find the exact difference between two dates in days, weeks, months, and years.

Select dates

How Dates Are Calculated

A date difference calculator helps answer common searches like how many days between two dates, how many weeks until an event, or how long a project lasted. It is useful for planning deadlines, counting days to birthdays, tracking milestones, and measuring elapsed time.

Why Month Counts Can Differ From Day Counts

Calendar months do not all have the same length, and leap years add extra days in February. That is why the result in months and years is not always a simple division of total days by 30 or 365.

Common Questions

How do you calculate days between two dates?+

Subtract the start date from the end date using calendar-aware date math that accounts for month lengths and leap years.

Why are month and year results different from total days?+

Months and years are calendar units with variable lengths, so they are not fixed conversions of total days.

Does this handle leap years correctly?+

Yes. Leap day and varying month lengths are included in the result calculations.

Can I use this for project timeline planning?+

Yes. It is useful for deadline windows, sprint duration checks, and milestone planning.