ISO 8601-1:2019
(Main)Date and time — Representations for information interchange — Part 1: Basic rules
Date and time — Representations for information interchange — Part 1: Basic rules
This document specifies representations of dates of the Gregorian calendar and times based on the 24-hour clock, as well as composite elements of them, as character strings for use in information interchange. It is also applicable for representing times and time shifts based on Coordinated Universal Time (UTC). This document excludes the representation of date elements from non-Gregorian calendars or times not from the 24-hour clock. This document does not address character encoding of representations specified in this document.
Date et heure — Représentations pour l'échange d'information — Partie 1: Règles de base
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INTERNATIONAL ISO
STANDARD 8601-1
First edition
2019-02
Date and time — Representations for
information interchange —
Part 1:
Basic rules
Date et heure — Représentations pour l'échange d'information —
Partie 1: Règles de base
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2019 – All rights reserved
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
3.1 Terms and definitions . 1
3.1.1 Basic concepts . 1
3.1.2 Time and date units . 5
3.1.3 Representations and formats . 8
3.2 Symbols .10
3.2.1 General.10
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
4 Fundamental principles .13
4.1 Basic rules .13
4.2 Time scales .13
4.2.1 The Gregorian calendar .13
4.2.2 The week calendar .14
4.2.3 The 24-hour clock .15
4.3 Time scale components and units .15
4.3.1 General.15
4.3.2 Calendar year and years duration .15
4.3.3 Calendar month and months duration.16
4.3.4 Calendar week number and weeks duration .16
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
4.3.8 Clock hour and hours duration.17
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
4.4 Expansion .18
4.5 Leading zeros .19
5 Date and time representations .19
5.1 General .19
5.2 Date .19
5.2.1 General.19
5.2.2 Calendar date .19
5.2.3 Ordinal date .21
5.2.4 Week date .21
5.3 Time of day .22
5.3.1 Local time of day .22
5.3.2 Beginning of the day .24
5.3.3 UTC of day .24
5.3.4 Local time scale and UTC .24
5.3.5 Omissions of time designator .25
5.4 Date and time of day .25
5.4.1 General.25
5.4.2 Complete representations .26
5.4.3 Representations other than complete .27
5.5 Time interval .27
5.5.1 Means of specifying time intervals .27
5.5.2 Duration.28
5.5.3 Complete representations .29
5.5.4 Representations other than complete .30
5.6 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
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
...
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