Date and Time on the Internet: Timestamps with additional information
draft-ryzokuken-datetime-extended-00
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Ujjwal Sharma
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2021-01-11
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Calendaring Extensions Working Group U. Sharma
Internet-Draft Igalia, S.L.
Obsoletes: 3339 (if approved) 11 January 2021
Intended status: Standards Track
Expires: 15 July 2021
Date and Time on the Internet: Timestamps with additional information
draft-ryzokuken-datetime-extended-00
Abstract
This document defines a date and time format for use in Internet
protocols for representation of dates and times using the proleptic
Gregorian calendar, with optional extensions representing additional
information including a time zone and a calendaring system.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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Task Force (IETF). Note that other groups may also distribute
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on 15 July 2021.
Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. Code Components
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provided without warranty as described in the Simplified BSD License.
Sharma Expires 15 July 2021 [Page 1]
Internet-Draft Timestamps Extended January 2021
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Two Digit Years . . . . . . . . . . . . . . . . . . . . . . . 4
4. Local Time . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.1. Coordinated Universal Time (UTC) . . . . . . . . . . . . 4
4.2. Local Offsets . . . . . . . . . . . . . . . . . . . . . . 5
4.3. Unknown Local Offset Convention . . . . . . . . . . . . . 5
4.4. Unqualified Local Time . . . . . . . . . . . . . . . . . 5
5. Date and Time format . . . . . . . . . . . . . . . . . . . . 6
5.1. Ordering . . . . . . . . . . . . . . . . . . . . . . . . 6
5.2. Human Readability . . . . . . . . . . . . . . . . . . . . 6
5.3. Rarely Used Options . . . . . . . . . . . . . . . . . . . 7
5.4. Redundant Information . . . . . . . . . . . . . . . . . . 7
5.5. Simplicity . . . . . . . . . . . . . . . . . . . . . . . 7
5.6. Internet Date/Time Format . . . . . . . . . . . . . . . . 7
5.7. Restrictions . . . . . . . . . . . . . . . . . . . . . . 9
5.8. Examples . . . . . . . . . . . . . . . . . . . . . . . . 10
6. Security Considerations . . . . . . . . . . . . . . . . . . . 12
7. Normative references . . . . . . . . . . . . . . . . . . . . 12
8. Bibliography . . . . . . . . . . . . . . . . . . . . . . . . 12
Appendix A. Day of the Week . . . . . . . . . . . . . . . . . . 13
Appendix B. Leap Years . . . . . . . . . . . . . . . . . . . . . 13
Appendix C. Leap Seconds . . . . . . . . . . . . . . . . . . . . 13
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 15
1. Introduction
Date and time formats cause a lot of confusion and interoperability
problems on the Internet. This document addresses many of the
problems encountered and makes recommendations to improve consistency
and interoperability when representing and using date and time in
Internet protocols.
This document includes an extension to an Internet profile of the
[ISO8601] standard for representation of dates and times using the
proleptic Gregorian calendar alongside any additional information.
Any dates and times that are required to be handled in a different
calendar system need to include the ID of the calendar which can be
handle by the implementations approximately. In the absence of a
calendar ID, the proleptic Gregorian calendar system is assumed.
There are many ways in which date and time values might appear in
Internet protocols: this document focuses on just one common usage,
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