Date Difference Calculator
Count the days, weeks and months between two dates.
Days
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Weekdays (Mon–Fri)
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Weeks
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Months & years
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Results update as you type.
About this calculator
A date difference calculator finds the exact time between two dates — in days, weeks, months and years. Use it for deadlines, project timelines, anniversaries or working out how long until an event.
Frequently asked questions
Does it include the last day?
By default it counts the nights between the two dates. Turn on "Count the end day" under advanced options to include both the start and end dates in the total.
Does it handle leap years?
Yes. The day count is exact and automatically accounts for leap years and different month lengths.
Results are estimates for general guidance only, not financial, medical or tax advice.