From: Brian Candler <b.candler@...>
Date: 2010-05-11T23:04:51+09:00
Subject: Re: Differences in Time v1.8.6 and 1.9.1

> You haven't even shown us what those print lines show. Are they what you 
> expect?  If not, what do you see, and what did you expect to see? Or is 
> the problem occurring later on in the code?

If I run just those lines, I get:

[1.8.6p114]
2010
Thu Jan 01 00:33:30 +0100 1970
Thu Jan 01 00

[1.9.2preview2]
2010
1970-01-01 00:33:30 +0100
1970-01-01 00

So the difference is simply that Time#to_s has a different default 
format.

$ ruby -e 'puts Time.now.to_s'
Tue May 11 15:02:06 +0100 2010
$ ruby19 -e 'puts Time.now.to_s'
2010-05-11 15:02:08 +0100

If that's the problem, then use Time#strftime to make it explicit what 
format you want.

The documentation of Time#to_s is clear:

[ruby 1.8]
------------------------------------------------------------------------
     Returns a string representing _time_. Equivalent to calling
     +Time#strftime+ with a format string of ``+%a+ +%b+ +%d+ +%H:%M:%S+
     +%Z+ +%Y+''.

        Time.now.to_s   #=> "Wed Apr 09 08:56:04 CDT 2003"


[ruby 1.9]
------------------------------------------------------------------------
     Returns a string representing _time_. Equivalent to calling
     +Time#strftime+ with a format string of ``+%Y-%m-%d+ +%H:%M:%S+
     +%z+'' for a local time and ``+%Y-%m-%d+ +%H:%M:%S+ +UTC+'' for a
     UTC time.

        Time.now.to_s       #=> "2007-10-05 16:09:51 +0900"
        Time.now.utc.to_s   #=> "2007-10-05 07:09:51 UTC"

Remember also that Time.at(2010) will give you the time 2,010 seconds 
after midnight at 1 Jan 1970.
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