Convert a date and time to ISO 8601 format, or parse an ISO 8601 string back to a readable date.
Fill in the form fields the tool shows.
Change modes or toggles if available.
Copy the generated output when it looks right (often updates live).
ISO 8601 is the international standard for representing dates and times unambiguously, such as 2026-08-10T18:00:00.000Z. It’s widely used in APIs, databases, and log files because it sorts correctly as plain text and avoids regional date-format ambiguity.
Complete the fields in ISO 8601 Date Converter. Output is produced in your browser from those inputs — copy it when ready.
Empty optional fields if you want a minimal result. Invalid combinations should surface an error message.
Whenever possible, ISO 8601 Date Converter processes your data locally with JavaScript in this page. That means drafts, secrets, and unfinished work stay on your device by default. Prefer this workflow when you do not want to upload sensitive text, tokens, passwords, or files to a third-party service.
The output is converted to UTC, indicated by the trailing "Z", which is the standard for ISO 8601 timestamps.
Yes, the parser accepts ISO 8601 strings with or without milliseconds and with or without a timezone offset.
For most FlyUtils tools, no. Processing happens in your browser with JavaScript. If a tool ever needs a server, that will be stated clearly on the page.
Yes. ISO 8601 Date Converter is free, with no sign-up and no artificial usage caps for normal personal and work use.
Yes. The page is mobile-first, so you can paste input, tweak options, and copy results from a phone or tablet.