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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.

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.

--
GregR



--- Bill  wrote:

>
> The basic concept is clear to me, it is usage that I cannot track
> down.
>
> For example 0700 UTC/GMT would also be 0700 Zulu.
>
> Here in Indiana, USA I am in the eastern time zone at my home and on
> portions of Lake Michigan. (Indiana time zones is its own amusing
> topic.)
>
> When on standard time I subtract 5 hours from UTC for zone time.
> When on
> daylight saving time I subtract 4 hours.
>
> Therefore if 0700 UTC or Zulu, my zone time is either 0200 or 0300,
> depending on whether or not daylight saving time is in effect.
>
> The designator for my time zone is Romeo (R). If I attach R or Romeo
> to the
> time in comminations or in the log, how do I account for standard or
> DST?
> Or is it just assumed that when used with a letter it is always
> standard
> time?
>
> Bill
>
>
>
> >
>


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