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ISO Date Converter

Convert any date into ISO 8601 format plus UTC, local, date-only, time-only, and weekday representations, instantly and for free.

Paste any ISO string, RFC date, or Unix timestamp in seconds/milliseconds.

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Converting Dates to ISO 8601

ISO 8601 is the international standard for representing dates and times in a machine-readable, unambiguous way. The ISO Date Converter takes any parseable date you paste in and instantly produces a full set of representations — ISO 8601, UTC, local, date-only, time-only, and weekday — so you can grab whichever format your system needs.

Why ISO 8601?

Because 2026-04-14T12:00:00Z means exactly one moment in time to every system on the planet. Formats like 04/14/2026 or 14.04.2026 are ambiguous across locales — ISO 8601 removes that ambiguity. It is the default format for JSON APIs, database timestamps, log files, and CI systems.

Inputs This Tool Accepts

  • ISO strings — 2026-04-14T12:00:00Z, 2026-04-14, 2026-04-14 09:30:00+02:00
  • RFC 2822 / HTTP dates — Tue, 14 Apr 2026 12:00:00 GMT
  • Unix timestamps in seconds (1776124800) or milliseconds (1776124800000) — detection is based on the magnitude of the number.
  • Human-readable strings understood by the browser's native Date constructor.

Timezone Toggle

Switch between UTC / Zulu and Local. UTC output always ends in Z. Local output includes the proper offset (e.g. +02:00) computed from the user's browser timezone, so it round-trips cleanly back to UTC.

Common Uses

  • Normalizing timestamps across mixed data sources before ingestion.
  • Building Last-Modified or If-Modified-Since HTTP headers.
  • Producing filename-safe date stamps (2026-04-14T12-00-00Z).
  • Verifying what a Unix timestamp really is in human terms.
  • Computing the weekday for scheduling logic.

Privacy

Everything runs inside your browser. No dates are uploaded, logged, or stored server-side.