date is not show up in correct format from excel with tab-delimited was generated from query

Hi,

My code below worked file and save file into txt file.  However, the date is the problem.  I have to open excel file and manulay change the format of the date to make it shows the correct date, other way, it alutomatic shows 00:00:00 when i first open the file.  How can i make the date automatic shows from the file i generated in excel?

<cfset tab = chr(9)>

<cfset Str = "">

<cfloop query="q_report">

<cfset Str = Str & q_report.purchasedNo & tab & q_report.desc & tab & q_report.Del_date & chr(13) & chr(10)>

</cfloop>

<cffile action="write" output="#Str#" file="#variables.file#">

thanks