What is ISO 8601?
ISO 8601 is an international standard for date and time representation. The basic format is YYYY-MM-DDTHH:mm:ss.sssZ (e.g., 2024-01-15T14:30:00.000Z).
Tool Categories
Free ISO 8601 Time Formatter | 1ClickTools
Format dates and times into ISO 8601, RFC 2822, UTC, local, epoch, and 12+ standard formats. Free developer tool. Fast, free, browser-based & 100% private.
Frequently Asked Questions
What is the difference between ISO 8601 and RFC 2822?
ISO 8601 uses a clean, sortable format (2024-01-15T14:30:00Z), while RFC 2822 uses a more human-readable format (Tue, 15 Jan 2024 14:30:00 +0000).
What is epoch time?
Epoch time (or Unix timestamp) is the number of seconds or milliseconds since January 1, 1970 00:00:00 UTC. It's widely used in programming and databases.
Which format should I use for APIs?
Most modern REST APIs use ISO 8601 UTC format (with the Z suffix). For legacy systems, Unix timestamps are common.
How accurate is this iso time formatter tool?
All processing runs entirely in your browser using verified algorithms. Results are computed with full double-precision — no server-side rounding or data transmission occurs.