Time & DateCalendar
Date Difference & Workdays Duration Calculator
Calculate the exact number of calendar days, weeks, business days, and weekends between two dates. Ideal for project deadlines and contract tracking.
Select Date Span
Total Elapsed Duration
85 Days
Equals 12 Weeks and 1 Days
Working Business Days (Mon-Fri):61 Days
Weekend Days (Sat-Sun):24 Days
Mathematical Formula: Date Span Delta & Workday Enumeration
Total Days = (End Date - Start Date) / (1000 × 60 × 60 × 24)
Enumerates calendar intervals and filters Monday-Friday workdays.
How to Use This Calculator
- 1Select your Start Date and End Date.
- 2Check whether to include the end date in the total count.
- 3View total days, total weeks, business workdays (Mon-Fri), and weekend days.
Practical Example: Project Deadline Span
Scenario: From Jan 5 to Mar 31.
Start Date:2026-01-05
End Date:2026-03-31
Result: Total Days: 85 days (12 weeks and 1 day) | Workdays: 61 business days | Weekend Days: 24 days
Out of 85 calendar days, 61 are active Monday-Friday business workdays.
Frequently Asked Questions
No. Calendar days include all 7 days of the week, while business days count only standard working days (Monday through Friday), excluding weekends.
Pro Calculation Tips
- Use the workdays metric to accurately estimate sprint capacity and delivery timelines.
Model Assumptions
- Does not automatically deduct regional public holidays unless manually adjusted.