UTC, local time, and zones
03DATE-TIME can be UTC, local with a time-zone reference, or floating local time.
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAM§ 3.3.5 ↗
RFC 5545 · § 3.3.5EXAMPLE
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03
Recognize floating time
An unqualified local time is not a globally fixed instant.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
Read the updated RFC section ↗
A trailing Z denotes UTC.
- A trailing Z denotes UTC.
- TZID references a time-zone definition rather than a fixed offset copied into every occurrence.
- Floating time has neither Z nor TZID and follows the consuming context’s local-time interpretation.
Examples are illustrative. Consult the linked RFC and its errata for implementation details.
Read the RFC section ↗Diagrams simplify the RFC. Read the linked sections for complete requirements.
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