ISO 8601 Date Converter / Validator

Validate ISO 8601 date strings and convert them to local time, UTC, Unix timestamp, and parsed offset. Datetimes require a timezone marker for clarity.

Free, browser-only validation. No sign-up and no data leaves your device.
Date-only values like 2026-05-12 are valid. Datetimes should include Z or an offset.
Type
Local Time
UTC ISO 8601
Unix Seconds
Parsed Offset

When ISO strings are ambiguous

An ISO datetime without Z or an offset can mean different instants on different computers. This validator asks for an explicit offset so API payloads, logs, and database records are easier to compare.

Unix Timestamp Converter Time Zone Converter Date Format Converter

FAQ

Is a date-only value valid? Yes. A date-only value such as 2026-05-12 is treated as a local calendar date.

Why require offsets for datetimes? It prevents accidental local-time interpretation of API and log timestamps.