Construct and evaluate RFC 3339 / ISO 8601 duration intervals (PnYnMnDTnHnMnS) and total timestamps.
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 years, months, days, hours, minutes, and seconds.
Review the standardized P...T... duration output.
Copy the ISO duration string for API requests or temporal math.
The 'T' character separates date components (Years, Months, Days) from time components (Hours, Minutes, Seconds).
Yes, it denotes 1 Year, 2 Months, 10 Days, 2 Hours, and 30 Minutes.
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).
