Calculate working days between dates or add business days to forecast project milestones.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Choose between calculating days between two dates or adding business days to a start date.
Choose a 5-day (Mon-Fri) or 6-day (Mon-Sat) workweek.
Instantly see the total business days, weekend days, and billable work hours.
Yes, it automatically excludes Saturdays and Sundays (or only Sundays if 6-day workweek is enabled).
Zero-egress companion tools in the Date & Time suite
Convert times across world timezones and compute exact business days.
Convert between Unix timestamps and human-readable UTC/ISO dates.
Calculate exact intervals, working business days, and future date offsets.
Calculate calendar and custom fiscal year quarters starting in any month (e.g. Feb, July, Oct).
