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BS ISO 8601-2:2019+A1:2025 Date and time. Representations for information interchange - Extensions >
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BS ISO 8601-2:2019+A1:2025 Date and time. Representations for information interchange - Extensions, 2025
- undefined
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, symbols and abbreviated terms
- 3.1 Terms and definitions
- 3.1.1 Basic concepts
- 3.1.2 Feature description
- 3.1.3 Seasons
- 3.2 Symbols and abbreviated terms
- 3.2.1 General
- 3.2.2 Time scale component symbols
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- 3.2.3 Composite component symbols
- 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
- 3.2.7 Component symbols, representations and expressions
- 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
- 4.3.4 Calendar day of year
- 4.3.5 Decade
- 4.3.6 Century
- 4.4 Numerical extensions
- 4.4.1 Negative values
- 4.4.2 Exponential values
- 4.4.3 Significant digits
- 4.5 Qualification of uncertainty and approximation
- 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
- 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
- 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
- 4.8.3 Groupings represented as months
- 5 Grouped time scale units
- 5.1 General
- 5.2 Unit definition
- 5.3 Unit value
- 5.4 Application within representations
- 5.4.1 General
- 5.4.2 Use of grouped units
- 5.4.3 Adherence to grouped unit boundaries
- 5.4.4 Representation with time shift
- 5.4.5 Conversion to basic time scale units
- 6 Set representation
- 6.1 Set of date and time expressions
- 6.2 Single element amongst set
- 6.3 Range element expansion
- 6.4 Set representations and expansion
- 6.5 Expressions with time scale components
- 6.6 Integer expressions
- 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
- 7.3.2 Beginning of the day
- 7.4 Time shift
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 8.4.2 Representations of calendar dates with reduced precision
- 8.4.3 Expanded representations of calendar dates
- 8.4.4 Qualification of a group of time scale components from the right
- 8.4.5 Qualification of individual time scale components
- 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
- 9.2 Calendar date representations with unspecified digits
- 9.2.1 Unspecified time scale component values from the right
- 9.2.2 Unspecified digit anywhere in time scale component
- 9.3 Date and time expressions with unspecified digits
- 10 Extended time interval representations
- 10.1 General
- 10.2 Unknown or open start or end time intervals
- 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
- 11 Explicit duration and extensions
- 11.1 General
- 11.2 Durational units
- 11.3 Representations
- 11.3.1 General
- 11.3.2 Composite representation
- 11.3.3 Precedence representation
- 11.4 Fractional duration
- 12 Selection of date and time
- 12.1 General
- 12.2 Selection rules
- 12.2.1 Selection of calendar month of year
- 12.2.2 Selection of calendar week of year
- 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
- 12.7 Selection of minutes
- 12.8 Selection of seconds
- 12.9 Selection of position
- 12.10 Selection with time interval
- 12.11 Application within representations
- 12.11.1 General
- 12.11.2 Context set by selection
- 12.11.3 Within time intervals
- 13 Recurring time intervals with repeat rules
- 13.1 General
- 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
- 13.4.3 Selection part and selection rules
- 13.5 Representations
- 13.6 Evaluation of a repeat rule
- 13.6.1 General
- 13.6.2 Time scale unit precision
- 13.6.3 Inheritance of component values from time interval start
- 14 Date and time arithmetic
- 14.1 General
- 14.2 Addition and subtraction
- 14.3 Multiplication
- 14.4 Date time modified by duration
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- 15 Profiles
- 15.1 General
- 15.2 Requirements
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- Annex A (informative) Profile: Extended Date/Time Format
- Annex B (informative) Interactions between eligible time intervals with the selection part
- Annex C (informative) Compatibility considerations of repeat rules with IETF RFC 5545 recurrences
- Annex D (informative) Evaluation of date time formulas and duration considerations
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- Bibliography [Go to Page]
