From: Dirk Traulsen <dirk.traulsen@...>
Date: 2008-01-08T19:34:03+09:00
Subject: Re: DateTime new_offset unexpected results

Hi Greg!

Am 8 Jan 2008 um 6:05 hat Greg Go geschrieben:

> @jd.to_s #=> 2008-03-09T13:24:59+00:00
> @ld.to_s #=> 2008-03-09T06:24:59-06:00
>                                 ^^^^^^
>                                 !!!!!!
> 
> It's my understanding that 13:24:59 offset by -6 hours should result
> in 
> 7:24:59, not 6:24:59. The @ld instance seems to be confused?

It looks like the reason could be the error that I found:

http://rubyforge.org/tracker/?func=detail&atid=1698&aid=14540&
group_id=426

It is a rounding error inside Numeric#divmod, which I found while 
inquiring a similar error in date. This bug was confirmed for 1.8.6 and 
is fixed (for future versions). If you compile Ruby yourself, this 
patch could fix your problem too.

Hope this helps
Dirk