FINAL INTERNATIONAL ISO/FDIS DRAFT STANDARD 8601 ISO/TC 154 Secretariat: DIN Data elements and interchange formats — Information interchange — Representation Voting begins on: 2000-10-05 of dates and times Voting terminates on: Éléments de données et formats d'échange — Échange d'information — 2000-12-05 Représentation de la date et de l'heure Please see the administrative notes on page iii RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFI- CATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION. 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Violators may be prosecuted. ii © ISO 2000 – All rights reserved ISO/FDIS 8601:2000(E) In accordance with the provisions of Council Resolution 15/1993, this document is circulated in the English language only. © ISO 2000 – All rights reserved iii ISO/FDIS 8601:2000(E) Contents Page Foreword......................................................................................................................................................................v Introduction ................................................................................................................................................................vi 1 Scope ..............................................................................................................................................................1 2 Normative references ....................................................................................................................................1 3 Terms and definitions....................................................................................................................................2 4 Fundamental principles.................................................................................................................................5 4.1 Basic concepts...............................................................................................................................................5 4.2 Common features, uniqueness and combinations ....................................................................................5 4.3 Time-units and reference systems...............................................................................................................6 4.3.1 Time-units.......................................................................................................................................................6 4.3.2 Date and time reference systems.................................................................................................................6 4.4 Characters used in the representations ......................................................................................................8 4.5 Use of separators...........................................................................................................................................9 4.6 Truncation ......................................................................................................................................................9 4.7 Expansion.......................................................................................................................................................9 4.8 Leading zeros.................................................................................................................................................9 4.9 Mutual agreement ..........................................................................................................................................9 5 Representations...........................................................................................................................................10 5.1 Explanations.................................................................................................................................................10 5.1.1 Characters used in place of digits or signs ..............................................................................................10 5.1.2 Characters used as designators ................................................................................................................10 5.2 Dates .............................................................................................................................................................11 5.2.1 Calendar date ...............................................................................................................................................11 5.2.2 Ordinal date ..................................................................................................................................................13 5.2.3 Week date .....................................................................................................................................................13 5.3 Time of the day.............................................................................................................................................15 5.3.1 Local time of the day ...................................................................................................................................15 5.3.2 Midnight ........................................................................................................................................................17 5.3.3 Coordinated Universal Time (UTC) ............................................................................................................17 5.3.4 Local time and Coordinated Universal Time.............................................................................................17 5.4 Combinations of date and time of the day ................................................................................................18 5.4.1 Complete representation.............................................................................................................................18 5.4.2 Representations other than complete .......................................................................................................19 5.5 Time-intervals...............................................................................................................................................20 5.5.1 Means of specifying time-intervals ............................................................................................................20 5.5.2 Separators and designators .......................................................................................................................20 5.5.3 Representation of duration.........................................................................................................................20 5.5.4 Complete representations...........................................................................................................................21 5.5.5 Representations other than complete .......................................................................................................23 5.6 Recurring time-intervals..............................................................................................................................23 5.6.1 Means of specifying recurring time-intervals ...........................................................................................23 5.6.2 Separators and designators .......................................................................................................................23 5.6.3 Complete representations...........................................................................................................................24