Issue 16943: Calendar day is misdefined (date-time-ftf) Source: NIST (Mr. Edward J. Barkmeyer, edbark(at)nist.gov) Nature: Uncategorized Issue Severity: Summary: In clause 9.5.3, 'calendar day' is defined as: 'time point that is defined by a given calendar and during which approximately one revolution of the earth occurs on its axis'. Clause 9.3 defines 'time point' as 'scale point that is in a time scale and that specializes the concept 'time interval'. Fortunately, 9.3 also says 'time point' is a concept type, so the idea of specialization makes sense. That is, the definition in 9.3 means: a time point is a scale point on a time scale, and a time point is a concept that specializes 'time interval'. A concept that specializes time interval is not a time interval during which the earth rotates -- its instances are. Recommendation: In clause 9.5.3, change the definition of calendar day to 'time point that is defined by a given calendar and that corresponds to time intervals during which approximately one revolution of the earth on its axis occurs'. In clause 9.3 reword the definition of time point to 'concept that specializes the concept time interval and that is a scale point on a time scale. Resolution: Revised Text: Actions taken: January 5, 2012: received issue Discussion: End of Annotations:===== iler: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Tue, 10 Jan 2012 13:33:49 -0500 To: issues@omg.org, date-time-ftf@omg.org From: Juergen Boldt Subject: issue 16943 -- Date Time FTF issue Date: Thu, 05 Jan 2012 15:27:30 -0500 From: Ed Barkmeyer Reply-To: edbark@nist.gov Organization: NIST User-Agent: Thunderbird 2.0.0.23 (Windows/20090812) To: issues@omg.org Subject: DTV Issue: Calendar day is misdefined X-NISTMEL-MailScanner-Information: Please contact postmaster@mel.nist.gov for more information X-NISTMEL-MailScanner-ID: q05KRZk9014308 X-NISTMEL-MailScanner: Found to be clean X-NISTMEL-MailScanner-SpamCheck: X-NISTMEL-MailScanner-From: edbark@nist.gov X-NISTMEL-MailScanner-Watermark: 1326400058.32117@Ub3xyTZWNroozb0Vi8DnTg X-Spam-Status: No X-NIST-MailScanner: Found to be clean X-NIST-MailScanner-From: edbark@nist.gov Specification: Date Time Vocabulary Version: beta-1 Title: Calendar day is misdefined Source: Ed Barkmeyer, NIST, edbark@nist.gov Summary: In clause 9.5.3, 'calendar day' is defined as: 'time point that is defined by a given calendar and during which approximately one revolution of the earth occurs on its axis'. Clause 9.3 defines 'time point' as 'scale point that is in a time scale and that specializes the concept 'time interval'. Fortunately, 9.3 also says 'time point' is a concept type, so the idea of specialization makes sense. That is, the definition in 9.3 means: a time point is a scale point on a time scale, and a time point is a concept that specializes 'time interval'. A concept that specializes time interval is not a time interval during which the earth rotates -- its instances are. Recommendation: In clause 9.5.3, change the definition of calendar day to 'time point that is defined by a given calendar and that corresponds to time intervals during which approximately one revolution of the earth on its axis occurs'. In clause 9.3 reword the definition of time point to 'concept that specializes the concept time interval and that is a scale point on a time scale. -- Edward J. Barkmeyer Email: edbark@nist.gov National Institute of Standards & Technology Manufacturing Systems Integration Division 100 Bureau Drive, Stop 8263 Tel: +1 301-975-3528 Gaithersburg, MD 20899-8263 Cel: +1 240-672-5800 "The opinions expressed above do not reflect consensus of NIST, and have not been reviewed by any Government authority." Best regards, -Juergen Juergen Boldt Director, Member Services 140 Kendrick Street, Building A Suite 300 Needham, MA 02494 USA Tel: 781 444 0404 x 132 fax: 781 444 0320 www.omg.org To: date-time-ftf@omg.org Subject: Date-Time Issue 16943 - Calendar day is misdefined X-KeepSent: DFBE27B4:77C39041-85257A1E:00727A2C; type=4; name=$KeepSent X-Mailer: Lotus Notes Release 8.5.3 September 15, 2011 From: Mark H Linehan Date: Fri, 15 Jun 2012 16:51:36 -0400 X-MIMETrack: Serialize by Router on D01MC604/01/M/IBM(Release 8.5.3 ZX853HP5|January 12, 2012) at 06/15/2012 16:51:37 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12061520-7182-0000-0000-000001C1D46E The proposed resolution to this issue adopts the recommendations that came with the issue. -------------------------------- Mark H. Linehan STSM, IBM Research Date-Time Issue 16943 - Calendar Day is Misdefined.doc