Days Between Dates Calculator
Total days, weeks, business days and hours between any two dates.
About this calculator
Whether you're counting down to a deadline, billing for a project, tracking a contract period or counting days until a vacation, this calculator gives you every reasonable measure of the time between two dates — total days, weeks, business days (Mon–Fri), weekend days, and even total hours and minutes.
How it works
The calculator does plain calendar arithmetic. Total days is the absolute difference in days between the two dates. Total weeks is total days ÷ 7 (rounded down). Total hours and minutes are derived from total days × 24 and total days × 1440 respectively.
Business days are counted manually by walking the calendar one day at a time and excluding Saturdays and Sundays. Public holidays are NOT excluded — that's intentional because holiday calendars vary by country, region, and even employer.
If you enter the end date before the start date, the calculator computes the absolute difference rather than returning a negative number. Dates work as you'd expect across leap years, DST changes (which don't affect calendar-day arithmetic) and month boundaries.
For pure age calculations (years + months + days), use the dedicated age calculator instead — it gives you the breakdown that matches what you'd write on a passport form. This calculator is better for total counts and business-day-only counts.
Formula
total_days = abs(end - start) / 86,400,000 (ms in a day)
total_weeks = floor(total_days / 7)
total_hours = floor(abs(end - start) / 3,600,000)
business_days = count days from start to end where day-of-week ∈ {Mon, Tue, Wed, Thu, Fri}Examples
1 Jan 2026 to 31 Mar 2026
First quarter of 2026 spans 89 days, of which 64 are weekdays — close to the standard estimate of 63 working days per quarter.
Result: 89 days — 12 weeks — 64 business days — 26 weekend days
Three-month leave: 1 Jun to 31 Aug 2026
A 3-month summer leave covers 91 calendar days and 65 business days (excluding public holidays).
Result: 91 days — 13 weeks — 65 business days