Date and Time

This page describes various URI formats known to appear in Internet standards.

Grammars

• RFC 3339: Date and Time on the Internet — the most common standard, use this one
• RFC 9110: rule "IMF-fixdate": the date typically used in most HTTP headers
• RFC 9110: rule "obs-date": an obsolete format of date that only supports 2-year dates
• RFC 9110: rule "rfc850-date": another obsolete format that only supports 2-year dates
• ISO 8601: A more comprehensive standard for describing dates and times from which RFC 3339 derives

See Also

• HTTP
• A venn diagram of RFC 3339 vs. ISO 8601