2012/6/28 Marcus Stollsteimer <sto.mar / web.de>:

> The desired behavior would be that "UTC" is used *consistently*
> in all 3 methods, as is already the case in Ruby 1.9.3.

I see.  I misunderstood.

However Ruby 1.8's %Z behavior is intended behavior because
Ruby 1.8 uses just a strftime() in libc.

So, this issue is a new feature request.
I guess it is difficult to implement, discuss and accept for Ruby 1.8.7
until the next (and last) Ruby 1.8.7 release.
-- 
Tanaka Akira