Calculate exact working days between two dates excluding weekends (Saturday/Sunday) and custom bank holidays.
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.
Configure input parameters, values, or strings in the interactive interface.
Review real-time mathematical calculations, metrics, or generated configurations.
Copy the output directly to your clipboard or use the formatted code snippet.
Yes, all computations run 100% locally in your web browser using Web APIs with zero data sent to external servers.
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.
