Parse ISO 8601 duration strings (P3DT4H30M) into human-readable time spans and seconds.
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.
Type an ISO string like PT1H30M or P3DT4H.
Inspect the parsed days, hours, minutes, and seconds.
Copy human duration text or total integer seconds.
P indicates Period (start of duration), and T precedes the time component (hours, minutes, seconds).
PT30M represents a duration of exactly 30 minutes (1,800 seconds).
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.
