ISO 8601 is an international standard for representing dates and times. A typical datetime looks like 2024-06-15T14:30:00Z or 2024-06-15T14:30:00+05:30, where T separates the date and time and the suffix indicates the timezone.

Does this tool work entirely in the browser?

Yes. All parsing and formatting is done in JavaScript inside your browser. No data is sent to any server.

What input formats does it accept?

The "To ISO 8601" mode accepts common formats such as MM/DD/YYYY, DD-MM-YYYY, YYYY/MM/DD, Unix timestamps (seconds), and natural strings like "June 15, 2024 2:30 PM". The "From ISO 8601" mode accepts full or partial ISO 8601 strings including date-only, datetime with Z, and datetime with a UTC offset.

What does the Z suffix mean?

Z stands for "Zulu" time, which is the same as UTC (Coordinated Universal Time), equivalent to a +00:00 offset.

Can I include a timezone offset in the output?

Yes. Use the "Offset" dropdown to select a UTC offset. When converting TO ISO 8601, the output timestamp will include that offset. When converting FROM ISO 8601, the result will be shown in that timezone.

ISO 8601 Converter

Convert any date or datetime string to ISO 8601 format, or parse an ISO 8601 string into a human-readable date.

Input

Date / time string

UTC Offset

Quick examples

Result

Enter a date and click Convert

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Summary

ISO 8601 is the international standard for representing dates and times. This converter lets you parse common date strings into ISO 8601 format and decode ISO 8601 timestamps into readable local dates. It supports dates with and without time components, UTC offsets, and week-date notation.

How it works

Paste or type a date string into the input field.
Choose whether to convert TO ISO 8601 or FROM ISO 8601.
Optionally select an output timezone offset.
The tool parses the input and displays the result immediately.
Copy the converted value with one click.

Use cases

Format API request payloads that require ISO 8601 dates.
Debug timestamps received from REST or GraphQL APIs.
Convert log timestamps to a readable local format.
Generate ISO 8601 strings for calendar or scheduling applications.
Validate that a date string is correctly formatted to the standard.
Convert between local time and UTC for international coordination.

Frequently Asked Questions

Last updated: 2026-05-28 · Reviewed by Nham Vu