Convert dates to and from ISO 8601 format.
This calculator becomes interactive when JavaScript is available. The page still provides its method, limits and related tools without JavaScript.
Enter the requested values, review the input assumptions, and calculate the result. The result uses deterministic calendar or arithmetic rules on the values you enter. Dates are normalized before calculation, and invalid inputs are rejected.
Standard-based. The result follows a published technical standard or the browser’s IANA time-zone data. Browser time-zone data can vary by version, so important historical or future rules should be confirmed.
Depends on the browser’s standards and time-zone database version. Repeated or nonexistent local times require an explicit choice.
The result follows a published technical standard or the browser’s IANA time-zone data. Browser time-zone data can vary by version, so important historical or future rules should be confirmed.
Depends on the browser’s standards and time-zone database version. Repeated or nonexistent local times require an explicit choice.
The ISO 8601 Converter is useful for logs, APIs, databases, debugging and data interchange.
Pay particular attention to seconds versus milliseconds, UTC versus local display and dates before 1970.
