Calculate exact business days, weekends, holidays, and working billable hours.
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.
Pick your start date and end date from the calendar pickers.
Set working hours per day and enter any public holidays to deduct.
Inspect net workdays, total hours, and weekend day breakdown.
Yes, weekends are automatically detected and deducted from the workday count.
Yes, enter any number of holiday days in the holiday deduction field.
Zero-egress companion tools in the Date & Time suite
Convert Microsoft Excel 1900 date system serial integers into standard ISO 8601 timestamps.
Calculate continuous Julian Day Numbers (JDN) and Modified Julian Date (MJD) from Gregorian dates.
Convert high-precision 19-digit nanosecond timestamps into formatted UTC strings.
Check exact clock shift dates and hour offsets for US, EU, and global timezones.
