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IS 7900: Data Elements and Interchange Formats - Information Interchange - Representation of Dates and Times PDF

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इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 7900 (2007): Data Elements and Interchange Formats - Information Interchange - Representation of Dates and Times [MSD 5: Documentation and Information] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 7900:2007 iSO 8601:2004 pi%?w ( t7%’??7 ) Indian Standard DATA ELEMENTS AND INTERCHANGE FORMATS — INFORMATION INTERCHANGE — REPRESENTATION OF DATES AND TIMES (Third Revision ) [es 01.140.30 @ BIS 2007 BUREAU OF iNI)l AN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 October 2007 Price Group 11 Documentation and Information Sectional Committee, MSD 5 NATIONAL FOREWORD This Indian Standard (Third Revision) which is identical with ISO 8601 : 2004 ‘Data elements and interchange formats — Information interchange — Representation of dates and times’ was adopted by Bureau of Indian Standards on the recommendation of the Documentation and Information Sectional Committee and approval of the Management and Systems Division Council. This standard, originally published in 1976, was based on ISO 2014:1976, In the first revision of this standard in 1999, ISO 8601 : 1988 was adopted and Technical Corrigendum 1 to the above International Standard was also incorporated. In the second revision of this standard in 2001, ISO 8601 : 2000 was adopted, This third revision of IS 7900 has been necessitated because of the publication of ISO 8601:2004 which cancels and replaces ISO 8601:2000. The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words ‘International Standard: appear referring to this standard, they should be read as ‘Indian Standard’, b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards, which are to be substituted in their respective places, are listed below along with their degree of equivalence for the editions indicated: International Standard Corresponding Indian Standard Degree of Equivalence ISO 31-0 : ~992 Quantities and units: IS 1890 (Part O) : 1995 Quantities and Identical Part OGeneral principles units: Part OGeneral principles ISO 31-1 : 1992 Quantities and units: IS 1890 {Part 1) : 1995 Quantities and do Part 1Space and time units: Part 1 Space and time (third revision) LSO/lEC 646 : 1991 Information IS 10315: 1997 Information technology do technology — ISO 7-Bit coded character — 7-Bit coded character set for set for information interchange information interchange (first revision) The technical committee responsible for the preparation of this standard has reviewed the provisions of following publications referred in this adopted standard and has decided that they are acceptable for use in conjunction with this standard: International Standard Title ISO 19018:2004 Ships and marine technology — Terms, abbreviations, graphical symbols and concepts on navigation IEC 60050-111: 1996/ International Electrotechnical Vocabulary — Chapter 111: Physics and Amd.1 chemistry — Time and related concepts IEC 60050-713:1998 International Electrotechnical Vocabulary — Part 713: Radiocommunications: transmitters, receivers, networks and operation Rec. ITU-R TF.460-5 Standard-frequency and time signal emissions ‘ ITU-T S,1 International Telegraph Alphabet No. 2 Annexes A and B of this Indian Standard are for information only and do not form a part of the standard, IS 7900:2007 !!308601 :2004 Indian Standard DATA ELEMENTS AND INTERCHANGE FORMATS — INFORMATION INTERCHANGE — REPRESENTATION OF DATES AND TIMES (Third Revision ) 1 Scope This International Standard is applicable whenever representation of dates inthe Gregorian calendar, times in the 24-hour timekeeping system, time intervals and recurring time intervals or of the formats of these representations are included ininformation interchange. Itincludes — calendar dates expressed interms ofcalendar year, calendar month and calendar day ofthe month; — ordinal dates expressed interms ofcalendar year and calendar day ofthe year — week dates expressed interms ofcalendar year, calendar week number and calendar day oftheweek; — localtime based upon the 24-hour timekeeping system; — Coordinated Universal Time ofday; — localtime and the difference from Coordinated Universal Time; — combination of date and time ofday; . time intervals; . recurring time intervals. This International Standard does not cover dates and times where words are used in the representation and dates andtimes where characters are not used inthe representation. This International Standard does not assign any particular meaning or interpretation to any data element that uses representations in accordance with this International Standard. Such meaning will be determined by the contextoftheapplication. 2 Terms and definitions Forthe purposes ofthis document, thefollowing terms and definitions apply. 2.1 Basic concepts 2.1.1 timeaxis mathematical representation ofthe succession intime of instantaneous events along aunique axis [IEC60050-111] 2.1.2 instant pointonthetime axis [IEC60050-111] NOTE Aninstantaneouseventoccursataspecificinstant. IS 7900:2007 1S08601 :2004 2.1.3 time interval partofthetime axis limited bytwo instants [IEC60050-111] NOTE A time intervalcomprisesall instantsbetweenthe two limitinginstantsand, unlessotherwisestated, the limitinginstantsthemselves. 2.?.4 time scale system of ordered marks which can be attributed to instants onthe time axis, one instant being chosen asthe origin [IEC 60050-111] NOTE 1 Atimescalemayamongstothersbechosenas: -- continuous,e.g.internationalatomictime(TAI)(seeIEC60050-713, item713-05-18] — continuouswithdiscontinuities,e.g. CoordinatedUniversalTime (UTC) dueto leap seconds,standardtimedue‘to summertimeandwintertime; — successivesteps,e.g. usualcalendars,wherethetimeaxisissplitupintoasuccessionofconsecutivetimeintervals andthesamemarkisattributedtoallinstantsofeachtimeinterval; —- discrete,e.g.indigitaltechniques. NOTE2 Forphysicalandtechnicalapplications,atimescalewithquantitativemarksispreferred,basedonachosen initialinstanttogetherwithaunitofmeasurement. NOTE3 Customarytimescalesusevariousunitsofmeasurementincombination,suchassecond,minute,hour,or varioustimeintetvalsofthecalendarsuchascalendarday,calendarmonthandcalendaryear. NOTE4 Atimescalehasa referencepointwhichattributesoneofthemarksofthetimescaletooneoftheinstants, thusdeterminingtheattributionofmarkstoinstantsforthetimescale. 2.1.5 time point date time mark attributed to anirstant b ymeans ofaspecified time scale [IEC 60050-1 11] NOTE1 Onatimescaleconsistingofsuccessivesteps,twodistinctinstantsmaybe expressedbythesametimepoint (seeNote1oftheterm“timescale”). NOTE2 Formanytimescaleswithquantitativemariis,thenumericalvalueofthetimepointofaninstantmayalsobe consideredtobeequaltothedurationbetweentheoriginofthetimescaleandtheconsideredinstant. NOTE3 InIEC60050-111 thisdefinitioncorrespondswiththeterm“date”. NOTE-4 Theterm“time”isotlenusedincommonlanguage.However,itshouldonlybeusedifthemeaningisclearly visiblefromthecontext,sincetheterm“time”isalsousedwithothermeanings. 2.f.6 duration non-negative quantity attributed to a time interval, the value of which is equal to the difference between the time points of the final instant and the initial instant of the time interval, when the time points are quantitative marks ‘[IEC60050-111] IS 7900:2007 ISO 8601:2004 NOTE1 In the case of discontinuitiesinthe timescale, suchas a leap second orthe change fromwintertimeto summertimeandback,thecomputationofthedurationrequiresthesubtractionoradditionofthechangeofdurationof thediscontinuity. NOTE2 Duration is one of the base quantities in the InternationalSystem of Quantities (ISQ) on which the internationalSystemofUnits(Sl)isbased,Theterm“time”insteadof“duration”isoftenusedinthiscontext. NOTE3 Fortheterm“duration”,expressionssuchas “time”or“timeinterval”are oftenused.The term“time”isnot recommendedinthissense andtheterm“timeinterval”isdeprecatedinthissense toavoidconfusionwiththeconcept “timeinterval”. NOTE4 TheS1unitofdurationisthesecond. 2.1.7 nominal duration duration expressed amongst others inyears, months, weeks ordays NOTE Thedurationofacalendaryear,acalendarmonth,acalendarweekoracalendardaydependsonitsposition inthecalendar.Therefore,theexactdurationofa nominaldurationcanonlybeevaluatedifthedurationofthecalendar years,calendarmonths,calendarweeksorcalendardaysusedareknown. 2.1.8 date time point representing a calendar day on a time scale consisting of an origin and a succession of calendar days NOTE InIEC60050-111 thisdefinitioncorrespondswiththeterm“calendardate”. 2.1.9 calendar date date representing a particular calendar day by its calendar year, its calendar month and its ordinal number within itscalendar month 2.1.10 ordinal date date representing a particular calendar day byitscalendar year and itsordinal number within itscalendar year 2.1.11 week date date representing a particular calendar day by the calendar year to which its calendar week belongs, the ordinal number of itscalendar week within that calendar year and itsordinal number within itscalendar week 2.1.12 Coordinated Universal Time UTC time scale which forms the basis of a coordinated radio dissemination of standard frequencies and time signals; itcorresponds exactly in rate with international atomic time, butdiffers from itbyan integral number of seconds [IEC60050-713] NOTE1 UTC isestablishedbytheInternationalBureauofWeightsandMeasures(BIPM, i.e.BureauInternationaldes PoidsetMesures)andthe InternationalEarthRotationService(IERS). UTCprovidesthebasisofstandardtime,theuse ofwhichislegal in mostcountries.The 15thConf&ence G6neral des Poidset Mesures (CGPM) (1975) judged in its Resolution5thatthisusagecanbestronglyrecommended. NOTE2 UTCisadjustedtoUT1bytheinsertionordeletionofseconds,knownas“leapseconds” NOTE3 GreenwichMeanTime(GMT) isinternationallyreplacedbyUTC.UTCisoften(incorrectly)referredtoasGMT. UTC isgenerallyusedbyaviationand maritimenavigationthatalsouseslocalapparenttime and localmean timefor celestialnavigation(seeISO19018). 3 IS 7900:2007 1S08601 :2004 NOTE4 Additionalinformationcanbefoundasfollows: — theURLfortheITUhttD:/Avww.ituin.t/itudoc/itu-r/rec/tf/index.html — theURLfortheInternationalBureauofWeightsandMeasureshttD://www.birIm.fr — theURLfortheInternationalEarthRotationServicehttD://hDiers.obsDmfr.. 2.1.13 UTC of day quantitative expression marking an instant within acalendar day inaccordance with UTC 2.1.14 standard time time scale derived from coordinated universal time, UTC, bya time shiftestablished in a given location bythe competent authority [IEC60050-111] NOTE Thistimeshiftmaybevariedinthecoumeofayear. 2.1.15 standard time of day quantitative expression marking an instant within a calendar day by the duration elapsed after midnight inthe local standard time .- [IEC60050-111] NOTE Standardtimeofdayiscalled“clocktime”inIEC60050-111. 2.1.16 local time locally applicable time of day such as standard time of day, oranon-UTC based time ofday . 2.1.17 recurring time interval series ofconsecutive time intervals ofthe same duration ornominal duration NOTE Ifthedurationofthetimeintervalsismeasuredincalendarentities,thedurationofeachtimeintervaldepends onthecalendardatesofitsstartanditsend. 2.2 Time units, nominal du rations and time intervals 2.2.1 second base unit of measurement of time in the International System of Units (S1)as defined by the International Committee ofWeights and Measures (CIPM, i.e.Comit4rInternational des Poids et Mesures) NOTE1 SeealsoISO31-1. NOTE2 Itisthebaseunitforexpressingduration, 2.2.2 leap second intentional time step of one second to adjust UTC to ensure appropriate agreement with UT1, a time scale based onthe rotation ofthe Earth [Rec. ITU-R TF.460-5] NOTE An insertedsecondiscelledpositiveleapsecondandanomittedsecondiscallednegativeleapsecond.A poaitii leapsecondisinsertedbetween[23:59:592] and[24:OO:OOZalndcan be representedas [23:59602]. Negative teapsecondsare achieved bythe omissionof[23:59:592]. Insertionoromissiontakes place as determinedby IIERS, normallyon30Juneor31Oecember,butifnecessaryon31Marchor30September. 4 IS 7900:2007 ISO 8601:2004 2.2.3 minute unitoftime, equal to 60 seconds [1s0 31-1] 2.2.4 hour unitoftime, equal to 60minutes [1s0 31-1] 2.2.5 day (unit oftime) unitoftime, equal to 24hours [1s0 31-1] 2.2.6 calendar day time interval SMing at midnight and ending at the next midnight, the latter being also the starting instant of thanextc%bdarday “ NOTE1 A@abndardayisoftenalsoreferredtoasday. N0TE2 w ~ti d aCatandardayis24hours;exceptifmodiiid by: — theinsertionordetetionofbap seconds,bydecisionoftheInternationalEarthRotationSarvics(IERS), or — theinse~or dabtionofothertimeintervals,asmaybeprescribedbylocalauthoritiestoalterthetimescaleoflocal time. 2.2.7 day (duration) du~”on of.a calendar day NOTE Theterm“day’app@salsotothedurationofanytimeintewalwhichstartsatacertaintimeofdayatacertain calendardayanderidsath saw W ofdayatthenextcalendarday. 2.2.8 calendar week time intetval of seven calendar days starting with a Monday NOm 1 Acalendarweekisoftenalsoreferredtoasweak. NOTE2 See3.2.2 forthenamesofthecalendardaysandtheirdaynumbefs, NOTE3 Acs~ndar weekmaybe identifiedbyi~ ordinalnumberwithinitscalendaryear. 2.2.9 week duration of acalendar week , NOIE Theterm%aek” ap~ies alsototheduratiin ofanytimeintervalwhichstartsat a certaintimeofday ata Certahcalendardayandendsatthesametimeofdayatthesamecalendardayofthenextcalendarweek. 2.2.10 calendar week number ordinal number which identifies a ~lendar week within its calendar year according to the rule that the first calendar week of a year is that one which includes the first Thursday of that year and that the last oalendar week of a calendar year isthe week immediately preceding thefirst calendar week ofthe next oalendar year 5

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