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Bs Iso 8601‑2:2019 BS ISO 8601‑2:2019 BSI Standards Publication Date and time — Representations for information interchange Part 2: Extensions WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 BS ISO 8601‑2:2019 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 8601‑2:2019. Together with BS ISO 8601‑1:2019, it supersedes BS ISO 8601:2004, which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee IST/47/‑/3, eBusiness. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. © The British Standards Institution 2019 Published by BSI Standards Limited 2019 ISBN 978 0 580 93759 0 ICS 01.140.30 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2019. Amendments/corrigenda issued since publication Date Text affected BS ISO 8601‑2:2019 INTERNATIONAL ISO STANDARD 8601-2 First edition 2019‑02‑26 Date and time — Representations for information interchange — Part 2: Extensions Date et heure — Représentations pour l'échange d'information — Partie 2: Extensions Reference number ISO 8601‑2:2019(E) © ISO 2019 BS ISO 8601‑2:2019 ISO 8601-2:2019(E) COPYRIGHT PROTECTED DOCUMENT © ISO 2019, Published in Switzerland or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior Allwritten rights permission. reserved. Unless Permission otherwise can be specified, requested no from part ofeither this ISOpublication at the address may be below reproduced or ISO’s or member utilized bodyotherwise in the in country any form of the requester. Ch. de Blandonnet 8 • CP 401 ISOCH‑ 1214copyright Vernier, office Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org ii © ISO 2019 – All rights reserved BS ISO 8601‑2:2019 ISO 8601-2:2019 Contents Page Foreword ......................................................................................................................................................................................................................................vii Introduction ............................................................................................................................................................................................................................viii 1 Scope ................................................................................................................................................................................................................................. 1 2 Normative references ...................................................................................................................................................................................... 1 3 Terms, definitions, symbols and abbreviated terms ....................................................................................................... 1 ....................................................................................................................................................................... 2 3.1.1 Basic concepts .................................................................................................................................................................... 2 3.1 Terms3.1.2 andFeature definitions description........................................................................................................................................................ 2 3.1.3 Seasons ..................................................................................................................................................................................... 4 3.2 Symbols and abbreviated terms............................................................................................................................................... 4 3.2.1 General...................................................................................................................................................................................... 4 3.2.2 Time scale component symbols .......................................................................................................................... 4 3.2.3 Composite component symbols .......................................................................................................................... 5 3.2.4 Symbols used to represent time scale component features ....................................................... 6 3.2.5 Symbols used in date and time representations .................................................................................. 6 3.2.6 Designator symbols used in date and time expressions ................................................................ 6 3.2.7 Component symbols, representations and expressions ................................................................ 7 4 Extensions to time scale components and units .................................................................................................................. 8 4.1 General ........................................................................................................................................................................................................... 8 4.2 Order of time scale units................................................................................................................................................................. 8 4.3 Additional explicit forms ................................................................................................................................................................ 8 4.3.1 General...................................................................................................................................................................................... 8 ................................................................................................................................................................... 8 4.3.3 Calendar day of week ................................................................................................................................................... 8 4.3.24.3.4 ValueCalendar prefixing day of year ..................................................................................................................................................... 9 4.3.5 Decade ....................................................................................................................................................................................... 9 4.3.6 Century ..................................................................................................................................................................................... 9 4.4 Numerical extensions ........................................................................................................................................................................ 9 4.4.1 Negative values .................................................................................................................................................................. 9 4.4.2 Exponential values ......................................................................................................................................................12 ............................................................................................................................................................13 ....................................................................................................13 4.4.3 Significant .............................................................................................................................................................................. digits 14 4.5 Qualification4.6.1 General of uncertainty................................................................................................................................................................................... and approximation 14 4.6 Unspecified digits ....................................................................14 ...................................................................14 4.7 Expanded4.6.2 Unspecified calendar year time .............................................................................................................................................................. component value in explicit forms 15 4.6.34.7.1 UnspecifiedGeneral................................................................................................................................................................................... time component digits in implicit forms 15 ............................................................................................................................15 4.7.3 Exponential calendar year ....................................................................................................................................15 4.7.2 Letter-prefixed calendar ............................................................................................................................................................ year 15 4.8 Sub‑year groupings ..........................................................................................................................................................................16
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