rfc9557v3.txt   rfc9557.txt 
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the timestamp while adjusting for summer time (daylight saving the timestamp while adjusting for summer time (daylight saving
time). However, the same calculation applied to time). However, the same calculation applied to
2020-01-01T00:00+01:00[+01:00] will produce an incorrect result 2020-01-01T00:00+01:00[+01:00] will produce an incorrect result
that will be off by one hour in the time zone Europe/Paris. that will be off by one hour in the time zone Europe/Paris.
CLDR: Common Locale Data Repository [CLDR], a project of the Unicode CLDR: Common Locale Data Repository [CLDR], a project of the Unicode
Consortium to provide locale data to applications. Consortium to provide locale data to applications.
For more information about timescales, see Appendix E of [RFC1305], For more information about timescales, see Appendix E of [RFC1305],
Section 3 of [ISO8601:1988], and the appropriate ITU documents Section 3 of [ISO8601:1988], and the appropriate ITU documents
[ITU-R-TF.460-6]. [ITU-R-TF.460-6]. (Note: [RFC1305] was obsoleted by [RFC5905], which
no longer contains the Appendix E referenced here.)
2. Updating RFC 3339 2. Updating RFC 3339
2.1. Background 2.1. Background
Section 4.3 of [RFC3339] states that an offset given as Z or +00:00 Section 4.3 of [RFC3339] states that an offset given as Z or +00:00
implies that "UTC is the preferred reference point for the specified implies that "UTC is the preferred reference point for the specified
time". The offset -00:00 is provided as a way to express that "the time". The offset -00:00 is provided as a way to express that "the
time in UTC is known, but the offset to local time is unknown". time in UTC is known, but the offset to local time is unknown".
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<https://www.rfc-editor.org/info/rfc1305>. <https://www.rfc-editor.org/info/rfc1305>.
[RFC2822] Resnick, P., Ed., "Internet Message Format", RFC 2822, [RFC2822] Resnick, P., Ed., "Internet Message Format", RFC 2822,
DOI 10.17487/RFC2822, April 2001, DOI 10.17487/RFC2822, April 2001,
<https://www.rfc-editor.org/info/rfc2822>. <https://www.rfc-editor.org/info/rfc2822>.
[RFC5322] Resnick, P., Ed., "Internet Message Format", RFC 5322, [RFC5322] Resnick, P., Ed., "Internet Message Format", RFC 5322,
DOI 10.17487/RFC5322, October 2008, DOI 10.17487/RFC5322, October 2008,
<https://www.rfc-editor.org/info/rfc5322>. <https://www.rfc-editor.org/info/rfc5322>.
[RFC5905] Mills, D., Martin, J., Ed., Burbank, J., and W. Kasch,
"Network Time Protocol Version 4: Protocol and Algorithms
Specification", RFC 5905, DOI 10.17487/RFC5905, June 2010,
<https://www.rfc-editor.org/info/rfc5905>.
[TR35] Davis, M., Ed., "Unicode Technical Standard #35: Unicode [TR35] Davis, M., Ed., "Unicode Technical Standard #35: Unicode
Locale Data Markup Language (LDML)", Locale Data Markup Language (LDML)",
<https://www.unicode.org/reports/ <https://www.unicode.org/reports/
tr35/#UnicodeCalendarIdentifier>. tr35/#UnicodeCalendarIdentifier>.
[TZDB] IANA, "Time zone and daylight saving time data", [TZDB] IANA, "Time zone and daylight saving time data",
<https://data.iana.org/time-zones/tz-link.html>. <https://data.iana.org/time-zones/tz-link.html>.
[TZDB-NAMING] [TZDB-NAMING]
IANA, "Theory and pragmatics of the tz code and data", IANA, "Theory and pragmatics of the tz code and data",
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