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BS ISO 8601-2:2019

BS ISO 8601-2:2019

$215.11

Date and time. Representations for information interchange – Extensions

Published By Publication Date Number of Pages
BSI 2019 86
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This document specifies additional representations of dates of the Gregorian calendar and times based on the 24-hour clock that extend the basic rules and composite elements of those defined in ISO 8601‑1. These representations are specified as character strings for use in information interchange. It is also applicable for representing times and time shifts based on Coordinated Universal Time (UTC).

These extensions include:

  • uncertain or approximate dates, or dates with portions unspecified;

  • extended time intervals;

  • divisions of a year;

  • sets and choices of calendar dates;

  • grouped time scale units;

  • repeat rules for recurring time intervals; and

  • date and time arithmetic.

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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
9 Foreword
10 Introduction
11 1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms
12 3.1 Terms and definitions
3.1.1 Basic concepts
3.1.2 Feature description
14 3.1.3 Seasons
3.2 Symbols and abbreviated terms
3.2.1 General
3.2.2 Time scale component symbols
15 3.2.3 Composite component symbols
16 3.2.4 Symbols used to represent time scale component features
3.2.5 Symbols used in date and time representations
3.2.6 Designator symbols used in date and time expressions
17 3.2.7 Component symbols, representations and expressions
18 4 Extensions to time scale components and units
4.1 General
4.2 Order of time scale units
4.3 Additional explicit forms
4.3.1 General
4.3.2 Value prefixing
4.3.3 Calendar day of week
19 4.3.4 Calendar day of year
4.3.5 Decade
4.3.6 Century
4.4 Numerical extensions
4.4.1 Negative values
22 4.4.2 Exponential values
23 4.4.3 Significant digits
4.5 Qualification of uncertainty and approximation
24 4.6 Unspecified digits
4.6.1 General
4.6.2 Unspecified time component value in explicit forms
4.6.3 Unspecified time component digits in implicit forms
25 4.7 Expanded calendar year
4.7.1 General
4.7.2 Letter-prefixed calendar year
4.7.3 Exponential calendar year
4.7.4 Significant digits
26 4.8 Sub-year groupings
4.8.1 Listing of seasons and common sub-year groupings
4.8.2 Groupings represented as time scale components
27 4.8.3 Groupings represented as months
5 Grouped time scale units
5.1 General
5.2 Unit definition
28 5.3 Unit value
5.4 Application within representations
5.4.1 General
29 5.4.2 Use of grouped units
30 5.4.3 Adherence to grouped unit boundaries
5.4.4 Representation with time shift
5.4.5 Conversion to basic time scale units
31 6 Set representation
6.1 Set of date and time expressions
6.2 Single element amongst set
6.3 Range element expansion
32 6.4 Set representations and expansion
6.5 Expressions with time scale components
6.6 Integer expressions
33 7 Explicit representation for date and time
7.1 General
7.2 Date
7.2.1 General
7.2.2 Calendar date
7.2.3 Ordinal date
7.2.4 Week date
7.3 Time of day
7.3.1 Local time of day
34 7.3.2 Beginning of the day
7.4 Time shift
35 7.5 Date with shift
7.6 Time of day with time shift
7.7 Date and time of day
7.7.1 General
7.7.2 Date and time only
7.7.3 Date and time with shift
7.8 Decade
36 7.9 Century
7.10 Omission of zero-valued components
7.11 Indication of precision
7.12 Decimal fractions for time
7.13 Representations other than complete
37 7.14 Time intervals
7.14.1 General
7.14.2 Time scale component order
7.14.3 Time shift indication
7.15 Recurring time intervals
38 8 Qualification of date and time expressions
8.1 General
8.2 Principles
8.2.1 Complete qualification
8.2.2 Group qualification
8.2.3 Individual qualification
8.2.4 Preferred representations for resolving ambiguity
39 8.3 Time scale components allowing qualification
8.3.1 General
8.3.2 Calendar year, left qualified:
8.3.3 Calendar month, left qualified
8.3.4 Calendar week of year, left qualified
8.3.5 Calendar day of month, left qualified
40 8.3.6 Calendar day of week, left qualified
8.3.7 Calendar day of year, left qualified
8.3.8 Clock hour, left qualified
8.3.9 Clock minute, left qualified
41 8.3.10 Clock second, left qualified
8.3.11 Decade, left qualified
8.3.12 Century, left qualified
8.4 Calendar date representations with qualification
8.4.1 Complete representation of a calendar date
42 8.4.2 Representations of calendar dates with reduced precision
43 8.4.3 Expanded representations of calendar dates
44 8.4.4 Qualification of a group of time scale components from the right
8.4.5 Qualification of individual time scale components
45 8.4.6 Allowing group and individual qualifications of time scale components
8.5 Date and time expressions with qualification
9 Unspecified digits
9.1 General
46 9.2 Calendar date representations with unspecified digits
9.2.1 Unspecified time scale component values from the right
48 9.2.2 Unspecified digit anywhere in time scale component
9.3 Date and time expressions with unspecified digits
49 10 Extended time interval representations
10.1 General
10.2 Unknown or open start or end time intervals
50 10.3 Qualification of dates in time intervals
10.3.1 General
10.3.2 Complete qualification
10.3.3 Partial qualification
10.4 Unspecified portions of dates in time intervals
10.5 Uncertain and approximate dates in unknown or open time intervals
10.6 Before and after with qualified time scale components
51 11 Explicit duration and extensions
11.1 General
11.2 Durational units
11.3 Representations
11.3.1 General
11.3.2 Composite representation
52 11.3.3 Precedence representation
53 11.4 Fractional duration
12 Selection of date and time
12.1 General
54 12.2 Selection rules
12.2.1 Selection of calendar month of year
12.2.2 Selection of calendar week of year
55 12.3 Selection of calendar day of month
12.4 Selection of week days
12.5 Selection of ordinal days in calendar year
12.6 Selection of hours
56 12.7 Selection of minutes
12.8 Selection of seconds
12.9 Selection of position
57 12.10 Selection with time interval
12.11 Application within representations
12.11.1 General
58 12.11.2 Context set by selection
12.11.3 Within time intervals
13 Recurring time intervals with repeat rules
13.1 General
59 13.2 Method of specification
13.3 Specification of time interval
13.4 Repeat rule
13.4.1 General
13.4.2 Eligibility part and eligible time intervals
60 13.4.3 Selection part and selection rules
13.5 Representations
61 13.6 Evaluation of a repeat rule
13.6.1 General
62 13.6.2 Time scale unit precision
13.6.3 Inheritance of component values from time interval start
63 14 Date and time arithmetic
14.1 General
14.2 Addition and subtraction
64 14.3 Multiplication
65 14.4 Date time modified by duration
66 15 Profiles
15.1 General
15.2 Requirements
67 Annex A (informative) Profile: Extended Date/Time Format
73 Annex B (informative) Interactions between eligible time intervals with the selection part
76 Annex C (informative) Compatibility considerations of repeat rules with IETF RFC 5545 recurrences
78 Annex D (informative) Evaluation of date time formulas and duration considerations
85 Bibliography

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BS ISO 8601-2:2019
$215.11