Check if DST is enabled for a certain date
<cffunction name="isDST" access="public" returntype="boolean" output="false">
<cfargument name="datetime" type="date">
<cfset var objTimeZone = createObject("java","java.util.Calendar").getInstance().getTimeZone()>
<cfset var objDateTime = createObject("java","java.util.Date")>
<cfset objDateTime.setTime(objDateTime.parse(dateFormat(ARGUMENTS.datetime) & " " & timeFormat(ARGUMENTS.datetime)))>
<cfreturn objTimeZone.inDaylightTime(objDateTime)>
</cffunction>