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What this calculator does
Count days, weeks, months, or years between two calendar dates.
How to use this calculator
- Enter a start date and end date.
- Review the calculation assumptions before using the result.
- Use the result for deadlines, anniversaries, and planning.
How to calculate
Choose the calculation mode where available, then enter the values requested by the date difference calculator. Results update immediately.
Worked example
With the example values shown above, the date difference is 5 years 3 months 5 days, and the total months is 63 months 5 days, and the total weeks is 274.71 weeks.
Understanding your result
Use the result for deadlines, anniversaries, and planning.
- Check whether your use case counts both end dates.
- Double-check values and units before calculating.
Frequently asked questions
What does this date difference calculator do?
Count days, weeks, months, or years between two calendar dates.
How do I use this date difference calculator?
Enter a start date and end date.
What does the result mean?
Use the result for deadlines, anniversaries, and planning.
What should I check before relying on it?
Check whether your use case counts both end dates.
Does it matter which date I enter first?
No — the calculator automatically identifies the earlier date and measures the gap between the two, regardless of the order you enter them.
Why do I get a different total when counting months versus days?
Months have different lengths, so 'total months' is a calendar-based count that can differ slightly from dividing total days by an average month length — both are shown so you can pick whichever fits your use case.