Date Difference Calculator
The exact years, months, weeks, and days between any two dates.
Every calculation runs locally in your browser. Works in either date order.
Difference
1y 0m 0d
Total days
365 days
Total weeks
52.1 weeks
For informational and educational purposes only — not professional or technical advice, and not a substitute for consulting a qualified professional about your specific situation. TrueMeasureKit is not liable for decisions made based on these results. See our Terms of Service.
Why "1 month" isn't a fixed number of days
Calendar months range from 28 to 31 days, so a true years/months/days breakdown has to walk the calendar forward rather than divide the total day count by a fixed average — otherwise a span landing near a month-end date (like January 31st) could come out wrong. The total-days and total-weeks figures are exact regardless, since they're counted directly rather than derived from the months breakdown.
Frequently asked questions
Why does the month/day breakdown look different from just dividing total days?
Because months have varying lengths (28-31 days) and years have leap days, an accurate years/months/days breakdown has to account for actual calendar dates, not just an average day count — which is why it can look different from a naive division.