ColdFusion Timezone Bug?

Question

I'm working with values of time in seconds and I've come across an odd bug and I'm hoping someone might explain if this is a bug or if this is some kind of timezone issue. I have code which calculates the difference, in seconds, between two fixed dates. ColdFusion gives me one answer, native Java methods give me a different answer. The difference is one hour which makes me think this is somehow related to timezone, but I can't figure out how to properly correct for this.
Any insight would be greatly appreciated.
Here's my sample code:
<cfset variables.TimeZone = CreateObject( "java", "java.util.TimeZone" ) />
<cfset variables.Calendar = CreateObject( "java", "java.util.Calendar" ).getInstance( variables.TimeZone.getTimeZone( "GMT" )) />
<cfset variables.Calendar.set( 2010, 6, 20, 15, 40, 0 ) />
<h1>Seconds from 01/01/1970 12:00 AM to 07/20/2010 3:40 PM</h1>
<p>
    According to Java:
    <cfoutput>#Int( variables.Calendar.getTimeInMillis() / 1000 )#</cfoutput>
</p>
<p>
    According to ColdFusion:
    <cfoutput>#DateDiff( "s", "01/01/1970 12:00 AM", "07/20/2010 3:40 PM" )#</cfoutput>
</p>

Answer 1

what tz is the cf server in? not
UTC i take it? on the server i'm working on today the tz is ITC (no DST)
& i get:
According
to Java: 1279640400
According to ColdFusion: 1279640400
using your
snippet.
maybe
this http://bit.ly/a9ZXss
will have some insight for you.
So if ColdFusion treats dates and times as in the local timezone, and my local timezone has DST, then I need to check and correct for that. And there's no simple (by "simple", I mean a native ColdFusion function that can handle this difference) solution?
So I need to employ something like this:
<cfset variables.timeDiff = DateDiff( "s", "01/01/1970 12:00 AM", "07/20/2010 3:40 PM" ) />
<cfif GetTimeZoneInfo().isDSTon IS TRUE>
    <cfset variables.timeDiff = variables.timeDiff + 3600 />
</cfif>
<p>
    According to ColdFusion (Adjusted):
    <cfoutput>#variables.timeDiff#</cfoutput>
</p>
Which works. I just with there was something native to CF that could handle dates outside of local timezone rules.