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Coldfusion MX and Daylight Savings

Posted on 2008-06-23
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Last Modified: 2012-06-27
I am running Coldfusion MX 7.0.2 on a fully patched Windows 2003 server.  I am running Java Version
1.4.2_11-b06 on the server.  I am querying data from an Oracle database.  If I view the Oracle data in something like Access the times are displayed correctly because Office doesn't account for DST.  Basically I have a value that is read every hour so each day has 24 readings.  My problem is that readings between November 4, 2007 and March 9, 2008 all are offset by 1 hour which messes up my data.  I've installed al the DST patches for Java and Coldfusion but it doesn't seem to help.  I also tried using <cfif> statements to evaluate the dates like <cfif newdate GT 11042007 LT 03092008> but no matter how I format or convert the dates it will not evaluate them and this portion of my code is basically skipped.  What I need is actually simple.  I want Coldfusion to completely ignore DST.  I just want it to read the database and return exactly what is there with no conversion but even if I do a to_char it still apparently applies DST before the conversion.  How can I disable DST changes altogether or is there something else I can do to fix this problem?

To get my data I am using the following SQL statement.
WHERE read_time BETWEEN TO_DATE ('#readtime# 00', 'yyyy/mm/dd hh24') AND TO_DATE ('#readtime# 23', 'yyyy/mm/dd hh24')
This gives me the correct data for today for example but anything in the range I listed above is off by an hour.  

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Question by:KCody
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LVL 36

Expert Comment

by:SidFishes
ID: 21849135
you can check to make sure that cf is actually -using- the correct jvm as multiples can be installed

run this bit

<cfset sys=CreateObject("java","java.lang.System")>
<cfoutput>
<p>You are running
   <strong>#sys.getProperty("java.vendor")#</strong>
   jvm version
   <strong>#sys.getProperty("java.version")#</strong>.
</p>
<hr />
</cfoutput>

afaik there's no way to -ignore- the dst patch (and I really can't imagine a reason why you'd want to)
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Author Comment

by:KCody
ID: 21849330
Here is the result I get when I run your code:
You are running Sun Microsystems Inc. jvm version 1.4.2_11.

DST is working properly, I guess what I need to know is how do I evaluate dates that fall within the DST range and add an hour to them so they will report correctly?
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LVL 36

Expert Comment

by:SidFishes
ID: 21849483
just use dateadd example using a temp query object

<cfset TempQry= querynew("")>
 <cfset queryaddcolumn  (TempQry, "Col1", "CF_SQL_integer", ListToArray("1,2,3"))>
<cfset queryaddcolumn  (TempQry, "Col2", "cf_sql_date", ListToArray("06/01/2008 12:00, 02/01/2008 12:00, 12/20/2007 12:00"))>
 
<cfloop query="tempqry">
<cfset d1 = dateadd("h",1,col2)>
<cfoutput>
#col2#: #d1#<br></cfoutput>
</cfloop>

and using between so only the 2 early dates are affected

<cfset TempQry= querynew("")>
 
<cfset queryaddcolumn  (TempQry, "Col1", "CF_SQL_integer", ListToArray("1,2,3"))>
<cfset queryaddcolumn  (TempQry, "Col2", "cf_sql_date", ListToArray("06/01/2008 12:00, 02/01/2008 12:00, 12/20/2007 12:00"))>
 <cfquery name="q2" dbtype="query">
select * from tempqry where col2 between '11/04/2007' and '03/09/2008'
</cfquery>
<cfloop query="q2">
<cfset d1 = dateadd("h",1,col2)>
<cfoutput>
#col2#: #d1#<br></cfoutput>
</cfloop>

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Accepted Solution

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KCody earned 0 total points
ID: 21858640
What you wrote may work but I can't get it to work with my application.  If I could see an easy example of evaluating date values from an Oracle source it would really help me out.
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