Format a local date and time in a selected IANA timezone as an RFC 3339 timestamp with the correct date-specific UTC offset.
RFC 3339 Format
2026-11-03T19:03:00+00:00
Like 2024-01-15T10:30:00+00:00
Quick Dates
RFC 3339 Output
About RFC 3339
RFC 3339 is a profile of ISO 8601 used for internet protocols. It defines a format likeYYYY-MM-DDTHH:MM:SS±HH:MM. Commonly used in APIs, databases, and JSON data.
Methodology and approach
The converter resolves the entered wall time in the selected IANA timezone and appends the offset in effect on that date. Ambiguous or nonexistent daylight-saving times are rejected.
Enter dates in the format shown by this tool. Date-only calculations use calendar dates; date-time fields use local time unless a timezone selector is provided. Timestamp outputs identify their units.
Common questions about this tool
