Date Difference Calculator
Find the exact duration between two dates — in calendar days, weeks, months, years, and business days.
Select both dates to calculate the difference.
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Instant Results
Duration updates as you pick dates.
Knowledge Base
Frequently Asked Questions
How are business days calculated?↓
Business days are weekdays (Monday–Friday). The calculator iterates through each day in the range and counts non-weekend days. Public holidays are not excluded, as these vary by country and region.
What if the start date is after the end date?↓
The calculator shows the absolute difference and notes that the start date is after the end date. The result is always a positive value regardless of order.
How are months and years counted?↓
The calculator counts complete calendar months and years — taking into account varying month lengths and leap years — then shows the remainder in days.
Can I calculate how many days until a future event?↓
Yes. Set the start date to today and the end date to your future event. The calendar days result shows exactly how many days remain.