Developer tools
Business days calculator (RF)
Count production-calendar business days between dates, or add N business days — based on the federal RF seed calendar.
Count business days in range
Business days
1
Add business days
Result date
2026-09-28
Uses federal RF calendar seed for 2011–2027; outside that range weekends-only approximation.
Your data never leaves the browser.
How it works
- Pick a date range to count working days.
- Or add N business days to a start date.
- Results use the RF production calendar seed when available.
FAQ
- Regional holidays?
- This tool uses the federal seed. Regional overrides are in Calendar API.
- Needs an API key?
- No — calendar data is bundled for this calculator.