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ISO 8601 Date Converter

Validate and convert ISO 8601, local time, UTC and RFC 2822 strings.

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Quick answer

ISO 8601 Converter runs locally in your browser for quick developer formatting, conversion or inspection work. ISO 8601 is the safest date format for APIs because it can include a precise time zone offset. This converter validates date strings and shows common alternatives. 

ISO: 2026-07-06T02:12:54.216Z
UTC: Mon, 06 Jul 2026 02:12:54 GMT
Local: Jul 06, 2026, 02:12:54 AM UTC
Unix seconds: 1783303974
Unix milliseconds: 1783303974216

What is ISO 8601 Converter?

ISO 8601 is the safest date format for APIs because it can include a precise time zone offset. This converter validates date strings and shows common alternatives.

How to use

  1. Paste an ISO 8601 or RFC 2822 date string.
  2. Check the parsed UTC and local outputs.
  3. Copy Unix seconds, milliseconds or normalized ISO output.

Example

Use this sample to confirm what ISO 8601 Converter does before pasting your own data.

Input
2026-06-29T12:00:00Z
Output
UTC, local, Unix seconds, Unix milliseconds and RFC-style output.

When to use it

Use ISO 8601 Converter for quick local checks, debugging, documentation prep, and one-off conversions where opening a full IDE or command-line workflow would be slower. For production-critical data, always review the output before committing or shipping it.

Frequently asked questions

What does Z mean in an ISO date?

Z means UTC, also known as zero offset.

Why is my local time different from UTC?

Local time applies your browser time zone offset to the same instant.