Parse ISO 8601 duration and repeating recurring intervals (e.g. R5/2026-09-01T00:00:00Z/P1D).
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.
Enter or configure your target inputs and parameters in the clean interface.
Calculations, formatting, and generation occur instantly in-browser using WebAssembly and WebCrypto.
Copy formatted results or download generated assets with a single click.
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).
