Sorting date in xsl

Can any body tell me how to sort in xsl.  Do I need to conver the following
format to number and then do sorting..

Thanks

Narsu





<root>

<date>Tue, 29 May 2001 22:37:32 -0400</date>

<date>Tue, 25 May 2001 22:37:32 -0400</date>

<date>Tue, 21 May 2001 22:37:32 -0400</date>

<date>Tue, 23 May 2001 22:37:32 -0400</date>

</root>



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