You can modify the cogformat.xml file to change
the text strings that are presented in Query Studio. 
 For
example, in your locale, the dates might be presented as follows:
 19/12/03
 19-Dec-03
 December
19, 2003
 Friday, December 19, 2003
 If your organization
uses the standard date format "19/12/03", you can change the
text that appears in Query Studio to "Corporate Standard (19/12/03)".
  
Procedure
- In the cogformat.xml file, locate the date format for the
locale you want to modify. For example, the following XML code defines
the text strings for date formats for the en-CA (English Canadian)
locale:  
...
<formatList name="qsdates" xml:lang="en-CA">
  <dateFormat dateStyle="short">19/12/03</dateFormat>
  <dateFormat dateStyle="medium">19-Dec-03</dateFormat>
  <dateFormat dateStyle="long">December 19, 2003</dateFormat>
  <dateFormat dateStyle="full">Friday, December 19,
2003</dateFormat>
</formatList>
...
  
- To change the text string for a data format, edit it in
the XML code. For example, change the text string for that format
as follows:  
<dateFormat dateStyle="short">Corporate Standard
(19/12/03)</dateFormat>
 The dates now appear
as follows:
 - Corporate Standard (19/12/03)
 
- 19-Dec-03
 
- December 19, 2003
 
- Friday, December 19, 2003