the "is Greater than or equal to" option is missing in the filter criteria of DataView

I can't get to see the option Greater than or equal to in the filder list when using Sharepoint Designer

I have the following using EQUAL

<xsl:variable name="Rows" select="/soap:Envelope/soap:Body/ddw1:GetListItemsResponse/ddw1:GetListItemsResult/ddw1:listitems/rs:data/z:row[number(translate(substring-before(@ows_Expires,'T'),'-','')) = number(translate(substring-before($Today,'T'),'-',''))]"/>

Any ideas how to modify this to get the Greater than or equal to equivalent.
Thanks in Advance