How to add dynamic datetime to the file name in the <attachment> tag in Xml

[cantstandable]

I need to add dynamic timestamp with the attachment file test.dat as (test_currentDateTime.dat)sample code which I need to modify:\[code\]<node name="testEmail" type="emailoutput"subject="this is a test mail with an attachment"xsl="&XSLPATH;test.xsl" outputType="text/plain" ><attachment type="text/plain" name="test.dat"/> </node>\[/code\]How can this be done in the \[code\]attachment\[/code\] tag that is inside the node tag in xml.Thanks in advance.