GLOSSARY

What is ISO 8601?

ISO 8601 is the unambiguous international date-time format like 2026-07-16T10:00:00Z. Learn the format and convert to a timestamp free.

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ISO 8601 is the international standard for writing dates and times in a way that sorts correctly and is unambiguous everywhere: year-month-day, a T separator, then the time, like 2026-07-16T10:00:00Z.

Why it beats other formats

Writing 07/08/2026 is ambiguous — is it July 8 or August 7? ISO 8601 always goes big-to-small (YYYY-MM-DD), so it is unambiguous and, as a bonus, sorts chronologically as plain text. This is why APIs, logs, and databases prefer it for human-readable timestamps.

The Z and offsets

A trailing Z means UTC ("Zulu"). Otherwise a time carries an offset like +02:00. Combined with the fixed field order, this makes an ISO 8601 timestamp fully self-describing — no guessing the timezone.

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FAQ

What does the Z mean in ISO 8601?›
It marks UTC (zero offset). A time without Z should include an explicit offset like +02:00.
Is ISO 8601 the same as a Unix timestamp?›
No — ISO 8601 is a human-readable string; a Unix timestamp is a number of seconds. Our converter turns one into the other.

Related

What is UTC?UTC is the global time standard that timestamps and servers use, with no daylight saving. Learn UTC vs GMT and convert a timestamp free.What is a Unix timestamp (epoch time)?A Unix timestamp is the number of seconds since 1970-01-01 UTC. Learn how epoch time works and convert a timestamp to a date free.How to convert a date to a Unix timestampTurn a human date into epoch seconds (or milliseconds) for APIs, JWTs, and databases. Free two-way converter plus the code one-liners.