ISO 8601 is an international date and time format. A common UTC example is 2026-05-21T15:48:50.777Z
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Developer timestamp format
ISO 8601 timestamp converter
ISO 8601 is the international standard for writing dates and times in an unambiguous format. Generate current timestamps, parse ISO strings, and convert them into UTC, a local-offset format, compact notation, and Unix time.
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The same instant in ISO 8601 using your device’s time zone, including its UTC offset at that instant
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Parse or create ISO 8601
- ISO 8601 is an international date and time format. A common UTC example is 2026-05-21T15:48:50.777Z
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- The same instant in ISO 8601 using your device’s time zone, including its UTC offset at that instant
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- UTC in compact ISO 8601 to the second, with hyphens, colons, and milliseconds omitted. Z means UTC
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- UTC date
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- Coordinated Universal Time (UTC), the worldwide time reference
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- Seconds since January 1, 1970 UTC
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UTC form
2026-05-21T15:48:50.777Z
Offset form
2026-05-22T00:48:50+09:00
Compact form
20260521T154850Z
ISO 8601 FAQ
What is ISO 8601?
ISO 8601 is an international date and time format. A common UTC example is 2026-05-21T15:48:50.777Z.
What does Z mean in an ISO timestamp?
Z means zero UTC offset, also called Zulu time. It marks the timestamp as UTC.
Why include the time zone offset?
Offsets such as +09:00 or -04:00 remove ambiguity and let software convert to the correct instant.