ISO 8601-1：2019 Date and time — Part 1： Basic rules.pdf

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Foreword

Introduction

1 Scope

2 Normative references

3 Terms, definitions and symbols

3.1 Terms and definitions

3.1.1 Basic concepts

Provläsningsexemplar / Preview INTERNATIONAL STANDARD ISO 8601-1 First edition 2019-02 Part 1: Date and time — Representations for information interchange — Basic rules Date et heure — Représentations pour l'échange d'information — Partie 1: Règles de base Reference number ISO 8601-1:2019(E) © ISO 2019

ISO 8601-1:2019(E) Provläsningsexemplar / Preview COPYRIGHT PROTECTED DOCUMENT © ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of the requester. ISO copyright office CP 401 • Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii © ISO 2019 – All rights reserved

Provläsningsexemplar / Preview ISO 8601-1:2019(E) 1 2 3 4 5 Contents Page Foreword ..........................................................................................................................................................................................................................................v Introduction ..............................................................................................................................................................................................................................vii Scope .................................................................................................................................................................................................................................1 Normative references ......................................................................................................................................................................................1 Terms, definitions and symbols ............................................................................................................................................................1 Terms and definitions .......................................................................................................................................................................1 3.1 Basic concepts ....................................................................................................................................................................1 3.1.1 3.1.2 Time and date units .......................................................................................................................................................5 3.1.3 Representations and formats ................................................................................................................................8 3.2 Symbols ......................................................................................................................................................................................................10 General...................................................................................................................................................................................10 3.2.1 3.2.2 Time scale component symbols .......................................................................................................................10 3.2.3 Composite component symbols .......................................................................................................................11 3.2.4 Symbols used in place of digits or signs ...................................................................................................11 3.2.5 Designator symbols ....................................................................................................................................................12 3.2.6 Separator symbols .......................................................................................................................................................13 Fundamental principles .............................................................................................................................................................................13 Basic rules ................................................................................................................................................................................................13 4.1 Time scales ..............................................................................................................................................................................................13 4.2 4.2.1 The Gregorian calendar ..........................................................................................................................................13 4.2.2 The week calendar ......................................................................................................................................................14 4.2.3 The 24-hour clock ........................................................................................................................................................15 Time scale components and units .......................................................................................................................................15 4.3 4.3.1 General...................................................................................................................................................................................15 4.3.2 Calendar year and years duration ..................................................................................................................15 4.3.3 Calendar month and months duration.......................................................................................................16 Calendar week number and weeks duration ........................................................................................16 4.3.4 4.3.5 Calendar day of month and days duration..............................................................................................16 4.3.6 Calendar day of week ................................................................................................................................................16 4.3.7 Calendar day of year ..................................................................................................................................................17 Clock hour and hours duration.........................................................................................................................17 4.3.8 4.3.9 Clock minute and minutes duration .............................................................................................................17 4.3.10 Clock second and seconds duration .............................................................................................................17 4.3.11 Decade ....................................................................................................................................................................................18 4.3.12 Century ..................................................................................................................................................................................18 4.3.13 Time shift.............................................................................................................................................................................18 Expansion .................................................................................................................................................................................................18 4.4 Leading zeros ........................................................................................................................................................................................19 4.5 Date and time representations ...........................................................................................................................................................19 General ........................................................................................................................................................................................................19 5.1 Date ................................................................................................................................................................................................................19 5.2 5.2.1 General...................................................................................................................................................................................19 Calendar date ...................................................................................................................................................................19 5.2.2 5.2.3 Ordinal date .......................................................................................................................................................................21 5.2.4 Week date ............................................................................................................................................................................21 5.3 Time of day ..............................................................................................................................................................................................22 Local time of day ...........................................................................................................................................................22 5.3.1 5.3.2 Beginning of the day ..................................................................................................................................................24 5.3.3 UTC of day ...........................................................................................................................................................................24 5.3.4 Local time scale and UTC .......................................................................................................................................24 Omissions of time designator ............................................................................................................................25 5.3.5 5.4 Date and time of day ........................................................................................................................................................................25 iii © ISO 2019 – All rights reserved

Provläsningsexemplar / Preview ISO 8601-1:2019(E) 5.5 5.6 5.4.1 General...................................................................................................................................................................................25 5.4.2 Complete representations ....................................................................................................................................26 5.4.3 Representations other than complete ........................................................................................................27 Time interval ..........................................................................................................................................................................................27 5.5.1 Means of specifying time intervals ................................................................................................................27 5.5.2 Duration................................................................................................................................................................................28 Complete representations ....................................................................................................................................29 5.5.3 5.5.4 Representations other than complete ........................................................................................................30 Recurring time interval.................................................................................................................................................................30 5.6.1 Means of specifying recurring time intervals ......................................................................................30 5.6.2 Separators and designators .................................................................................................................................30 5.6.3 Complete representations ....................................................................................................................................30 5.6.4 Representations other than complete ........................................................................................................31 Annex A (informative) Example date and time expressions and representations ............................................32 Bibliography .............................................................................................................................................................................................................................38 iv © ISO 2019 – All rights reserved

Provläsningsexemplar / Preview ISO 8601-1:2019(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/iso/foreword .html. This document was prepared by Technical Committee ISO/TC 154, Processes, data elements and documents in commerce, industry and administration. This first edition of ISO 8601-1, together with ISO 8601-2, cancels and replaces ISO 8601:2004, which has been technically revised. The main changes compared to ISO 8601:2004 are as follows: — conversion of the content as Part 1 with the Part title “Basic rules” due to the addition of another Part 2 “Extensions” of ISO 8601; — replacement of the term “midnight” with “beginning of day”, disallowing the value “24” for hour; — update of terms and definitions: — “time point” is now “time”; — “local time” is now “local time of day”; — added definition for “time of day” and “local time scale”; — updated definitions for “standard time of day”, “local time of day” and “UTC of day” to rely on “time of day”; — combined two “day” terms in different domains for consistency; — change of the representation of “leap seconds”; — clarification of “calendar day” expressions intended to mean “calendar day of week” (etc.); — amendment of the recurring time interval (3.1.1.11) to provide a link to ISO 8601-2:2019 which contains in Clause 5 the “repeat rules for recurring time intervals”. A list of all parts in the ISO 8601 series can be found on the ISO website. v © ISO 2019 – All rights reserved

Provläsningsexemplar / Preview ISO 8601-1:2019(E) Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www .iso .org/members .html. vi © ISO 2019 – All rights reserved

Provläsningsexemplar / Preview ISO 8601-1:2019(E) Introduction The purpose of this document is to provide a standard set of date and time format representations for information interchange, in order to minimize the risk of misinterpretation, confusion and their consequences. This document specifies a set of date and time format representations utilizing numbers, alphabets and symbols defined in ISO/IEC 646. These representations are meant to be both human recognizable and machine readable. This document retains the most commonly used expressions for date and time of day and their representations from earlier International Standards in the field, including earlier editions of ISO 8601 and its predecessors. © ISO 2019 – All rights reserved vii

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