Date Duration & Business Days Calculator
Count days, weeks, and business days between dates. Add or subtract working days with US/UK holidays and share deep links like /time/duration?start=2025-11-01&end=2025-12-15&bizdays=US.
Use negative numbers to count backwards.
Calendar span
7 days
Inclusive: 8 days
Dec 15, 2025 → Dec 22, 2025
Weeks & weekdays
1w 0d
6 weekdays · 2 weekend days
Business days (US)
6
Includes weekends + region-specific holidays
Add/Subtract business days
Starting from Dec 15, 2025, moving forward 5 working days in the US calendar lands on:
Monday, December 22, 2025
Business days skip weekends plus official holidays for the region you selected.
Deep-link any scenario by sharing URLs like /time/duration?start=2025-11-01&end=2025-12-15&bizdays=US.
Upcoming holidays (US)
Keep these non-working days in mind when planning timelines.
Christmas Day
Thursday, December 25, 2025
New Year's Day
Thursday, January 1, 2026
Martin Luther King Jr. Day
Monday, January 19, 2026
Presidents' Day
Monday, February 16, 2026
Memorial Day
Monday, May 25, 2026
Juneteenth
Friday, June 19, 2026
Why planners link here
Legal, finance, and operations teams need a single source of truth for date math. Tinapps tracks weekdays, weekends, and observed holidays so remote teams agree on timelines without emailing screenshots.
Workflow ideas
- Attach a deep link to SOWs so clients can see exactly how many working days span a milestone.
- Embed the business-day offset in incident runbooks to forecast postmortem due dates.
- Share upcoming holiday lists during handoffs so teams see when coverage gaps might occur.