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    Re: Time zone by letter and DST
    From: Bill B
    Date: 2007 Aug 21, 01:16 -0400

    > From: "Greg R." 
    > I believe the letter designations are based on the offset from GMT
    > (i.e. zone description) for the current time in use, without any
    > reference to whether DST is being observed or not.
    Agreed if you mean standard time and designation based on longitude.
    > Couldn't find any definitive answer to the question of this thread
    > topic, so I'd guess the logical (and technically correct) answer would
    > be that the letter designator would change during periods when DST is
    > in effect, and revert back to the "normal" one when it's not.
    Disagree.  UTC is UTC. Designator is designator based on long.  Plus or
    minus is just that, local conventions do not come into play, so it is up the
    the recipient/reader to make any adjustments.  I see no evidence that S goes
    to R during DST.  An interesting and potentially useful concept however, but
    I suspect true professional mariners have their way, and this twist would be
    a pain.
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