Date Difference Calculator
Count days, weeks, months and years between any two dates.
How to use this tool
- Select the start and end dates.
- Click Calculate.
- Read days, weeks, months and years, plus a breakdown.
How it works
The date span is decomposed into whole years, months and remaining days using calendar math, and also shown as total days and weeks.
Tips
- Decide inclusivity up front: elapsed vs counted-inclusive differs by one.
- Use the same timezone for both dates to avoid off-by-one surprises.
Limitations
Results depend on local timezone settings.
Frequently asked questions
How many days are in these two dates?
The absolute difference in milliseconds / 86,400,000, corrected to whole calendar days.
Does it count the start and end day?
It counts full days elapsed; for an inclusive count (both days) add one to the result.
Can I express it in weeks and months?
Yes — results show days, weeks+, months+ and years+ simultaneously.