Time Zone Data Distribution Service
draft-ietf-tzdist-service-09

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Document Type Active Internet-Draft (tzdist WG)
Last updated 2015-07-09 (latest revision 2015-06-29)
Replaces draft-douglass-timezone-service
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Stream WG state Submitted to IESG for Publication (wg milestone: Jan 2015 - WGLC for time zone d... )
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Network Working Group                                        M. Douglass
Internet-Draft                                       Spherical Cow Group
Intended status: Standards Track                                C. Daboo
Expires: December 31, 2015                                         Apple
                                                           June 29, 2015

                  Time Zone Data Distribution Service
                      draft-ietf-tzdist-service-09

Abstract

   This document defines a time zone data distribution service that
   allows reliable, secure and fast delivery of time zone data and leap
   second rules to client systems such as calendaring and scheduling
   applications or operating systems.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on December 31, 2015.

Copyright Notice

   Copyright (c) 2015 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
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Douglass & Daboo        Expires December 31, 2015               [Page 1]
Internet-Draft               TZDIST Service                    June 2015

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Conventions . . . . . . . . . . . . . . . . . . . . . . .   5
   2.  Architectural Overview  . . . . . . . . . . . . . . . . . . .   5
   3.  General Considerations  . . . . . . . . . . . . . . . . . . .   6
     3.1.  Time Zone . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.2.  Time Zone Data  . . . . . . . . . . . . . . . . . . . . .   7
     3.3.  Time Zone Meta-Data . . . . . . . . . . . . . . . . . . .   7
     3.4.  Time Zone Data Server . . . . . . . . . . . . . . . . . .   7
     3.5.  Observance  . . . . . . . . . . . . . . . . . . . . . . .   7
     3.6.  Time Zone Identifiers . . . . . . . . . . . . . . . . . .   7
     3.7.  Time Zone Aliases . . . . . . . . . . . . . . . . . . . .   8
     3.8.  Time Zone Localized Names . . . . . . . . . . . . . . . .   8
     3.9.  Truncating Time Zones . . . . . . . . . . . . . . . . . .   8
     3.10. Time Zone Versions  . . . . . . . . . . . . . . . . . . .  10
   4.  Time Zone Data Distribution Service Protocol  . . . . . . . .  10
     4.1.  Server Protocol . . . . . . . . . . . . . . . . . . . . .  10
       4.1.1.  Time Zone Queries . . . . . . . . . . . . . . . . . .  11
       4.1.2.  Time Zone Formats . . . . . . . . . . . . . . . . . .  11
       4.1.3.  Time Zone Localization  . . . . . . . . . . . . . . .  12
       4.1.4.  Conditional Time Zone Requests  . . . . . . . . . . .  12
       4.1.5.  Expanded Time Zone Data . . . . . . . . . . . . . . .  14
       4.1.6.  Server Requirements . . . . . . . . . . . . . . . . .  14
       4.1.7.  Error Responses . . . . . . . . . . . . . . . . . . .  14
       4.1.8.  Extensions  . . . . . . . . . . . . . . . . . . . . .  14
     4.2.  Client Guidelines . . . . . . . . . . . . . . . . . . . .  14
       4.2.1.  Discovery . . . . . . . . . . . . . . . . . . . . . .  14
         4.2.1.1.  Time Zone Data Distribution Service SRV Service
                   Labels  . . . . . . . . . . . . . . . . . . . . .  15
         4.2.1.2.  Time Zone Data Distribution Service TXT records .  15
         4.2.1.3.  Time Zone Data Distribution Service Well-Known
                   URI . . . . . . . . . . . . . . . . . . . . . . .  16
           4.2.1.3.1.  Example: well-known URI redirects to actual
                       context path  . . . . . . . . . . . . . . . .  17
       4.2.2.  Synchronization of Time Zones . . . . . . . . . . . .  17
         4.2.2.1.  Initial Synchronization of All Time Zones . . . .  17
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