The original time zone should be set to the current time zone at routine 
invocation
-----------------------------------------------------------------------------------

                 Key: CORE-6034
                 URL: http://tracker.firebirdsql.org/browse/CORE-6034
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 4.0 Beta 1
            Reporter: Adriano dos Santos Fernandes


The standard says that at routine invocation, "the value of the original time 
zone displacement is set to the value of the current time zone displacement" 
during the call.

The original time zone cannot be changed by the user, but SET TIME ZONE TO 
LOCAL resets the current time zone to the original one.

So in fact the standard expects that the code below returns "America/New_York, 
America/Los_Angeles" but we instead return "America/New_York, 
America/Sao_Paulo".

We have some complications (like selectable procedure or execute statements) 
that should also be taken into account.


------------
execute block returns (t1 timestamp with time zone, t2 timestamp with time zone)
as
  declare procedure p0 returns (t1 timestamp with time zone, t2 timestamp with 
time zone)
  as
  begin
        set time zone 'America/New_York';
    t1 = current_timestamp;
        set time zone local;
        t2 = current_timestamp;
  end

  declare procedure p1 returns (t1 timestamp with time zone, t2 timestamp with 
time zone)
  as
  begin
    set time zone 'America/Los_Angeles';

    execute procedure p0 returning_values t1, t2;
  end
begin
  -- Initial time zone: 'America/Sao_Paulo';

  execute procedure p1 returning_values t1, t2;
  suspend;
end!
------------

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