From: Austin Ziegler <Austin.Ziegler@...>
Date: 2004-05-14T21:47:37+09:00
Subject: Re: Bug in Marshal?

> From: matt [mailto:mhm26@drexel.edu] 
> Sent: 13 May 2004 20.24
> Subject: Bug in Marshal?
> 
> With the usual deep_copy:
> 
> # Deep copy
> class Object
>   def deep_copy
>     Marshal.load(Marshal.dump(self))
>   end
> end
> 
> I get the following (irb 0.9(02/07/03))
> 
> irb(main):001:0> fmt = "%m-%d-%Y %H:%M"
> => "%m-%d-%Y %H:%M"
> irb> original = Time.gm(2004, 04, 25, 22, 56)
> => Sun Apr 25 22:56:00 UTC 2004
> irb> copy = original.deep_copy
> => Sun Apr 25 18:56:00 Eastern Daylight Time 2004
> irb> [original, copy].map {|t| t.strftime(fmt)}
> => ["04-25-2004 22:56", "04-25-2004 18:56"]
> irb> original.hour
> => 22
> irb> copy.hour
> => 18
> irb> original.hour <=> copy.hour
> => 1
> irb> original <=> copy
> => 0

Not as bad as all that; I think that it's an artifact of how Time is
constructed, not in Marshal. If you know you're dealing with Time, and
want deal only with UTC (GMT) times, do:

copy = original.deep_copy.utc

Logically, copy.zone should be the same as original.zone, but as I said,
I think that's a Time problem.

-austin
--
austin ziegler * austin.ziegler@evault.com