Check whether a date or time string is valid ISO 8601 format directly in your browser for fast, reliable validation.
Supports date (YYYY-MM-DD), time (hh:mm[:ss][Z|±hh:mm]), date-time, duration (P…), and interval (date1/date2 or date1/duration).
Parse and validate ISO 8601 date / time / interval / duration strings. Shows extracted parts and the equivalent UTC.