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You can customize junit's stylesheet by adding java.util.Date to the namespace like this:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
xmlns:Date="http://www.saxon.com/java/java.util.Date">
java.util.Date is now available in the namespace and can be inserted into the xsl stylesheet something like this:
Last Modified: <xsl:value-of select="Date:toString(Date:new())" />
Ant's optional.jar library contains two JUnit stylesheets called junit-frames.xsl and junit-noframes.xsl. These files can be extracted and modified as illustrated above to insert a date and time string into your reports.