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  1. OMG Issue

BSA — using Time Service

  • Key: BSA-17
  • Legacy Issue Number: 3595
  • Status: closed  
  • Source: Japan Biological Informatics Consortium ( Martin Senger)
  • Summary:

    I would like to discuss the usage of data types from TimeBase module. It
    is probable that I just need some patient explanation - but it may also
    turn out that some clarification in our bsa spec could be made. I mean a
    clarification how to use the TimeBase data types properly.

    The talk is about the "absolute" attributes: created, started, ended
    (whatever moment they mean - it is a different topic).

    These attributes are expressed as TimeBase::UtcT. Which means that each
    of them consists from 4 values: TimeT, two InaccuracyT's and TdfT.
    The simplest is probably TdfT which defines in which time zone the
    analysis was executed. Is this interpretation correct?
    The members for inaccuracy may be used to say that the main time (in
    TimeT, see below) is actually only precise for milliseconds - because I
    guess most implementations and languages give us easily only milliseconds
    and not 100 nanoseconds. Again, would this interpretation of these
    attributes be correct?
    The main attribute is TimeT. Here is the definition from the TimeBase

    "TimeT represents a single time value, which is 64 bits in size, and
    holds the number of 100 nanoseconds that have passed since the base time.
    For absolute time the base is 15 October 1582 00:00 of the Gregorian
    Calendar. All absolute time shall be computed using dates from the
    Gregorian Calendar."

    My question is: Does CORBA Time Service specify that this attribute
    must be an absolute time? Would not be easier (and more appropriate for
    our purposes) to say in our spec that this time is relative to the
    beginning of the epoch (1/1/1970)? In other words, there are actually two

    • Do we need to use an absolute time here (to remain compliant with the
      Time Service)?
    • And if the answer is "no", then: do we want to have here an absolute
      gregorian time?
  • Reported: BSA 1.0b1 — Wed, 3 May 2000 04:00 GMT
  • Disposition: Resolved — BSA 1.0
  • Disposition Summary:

    Accepted. Yes, we use absolute time, in compliance with the Time Service. No change to specification

  • Updated: Fri, 6 Mar 2015 20:57 GMT