How can i get oldest Date in BI Publisher

Question

I'm designing report template for Siebel 8.1.1 and i'm using Oracle BI Publisher Desktop for word 10.1.4.3, in the XML file i have a date element, my question is how can i calculate the oldest date from this XML ? is there any (minimum) function or expression that i can apply it to date?
Thanks and Best Regards.

Answer 1

Like this, where Fecha_Creacion is a Date Field in 'YYYY-MM-DD' format:
<?xdoxslt:set_variable($_XDOCTX, 'FechaMin', xdoxslt:sysdate_as_xsdformat())?>
<?xdoxslt:set_variable($_XDOCTX, 'DifMin', 0)?>
<?xdoxslt:set_variable($_XDOCTX, 'FechaMax', xdoxslt:sysdate_as_xsdformat())?>
<?xdoxslt:set_variable($_XDOCTX, 'DifMax', 32000)?>
<?for-each:ServiceRequest?>
<?xdoxslt: set_variable($_XDOCTX, 'estaDiffMin', xdoxslt: date_diff('d', Fecha_Creacion, xdoxslt: sysdate_as_xsdformat(), $_XDOLOCALE, $_XDOTIMEZONE))?>
<?if:(xdoxslt:get_variable($_XDOCTX, 'estaDiffMin') > xdoxslt:get_variable($_XDOCTX, 'DifMin'))?>
<?xdoxslt:set_variable($_XDOCTX, 'DifMin', xdoxslt:get_variable($_XDOCTX, 'estaDiffMin'))?>
<?xdoxslt:set_variable($_XDOCTX, 'FechaMin', Fecha_Creacion)?>
<?end if?>
<?if:(xdoxslt:get_variable($_XDOCTX, 'estaDiffMin') < xdoxslt:get_variable($_XDOCTX, 'DifMax'))?>
<?xdoxslt:set_variable($_XDOCTX, 'DifMax', xdoxslt:get_variable($_XDOCTX, 'estaDiffMin'))?>
<?xdoxslt:set_variable($_XDOCTX, 'FechaMax', Fecha_Creacion)?>
<?end if?>
<?end for-each?>
From:<? format-date:xdoxslt: get_variable($_XDOCTX, 'FechaMin');'dd "de" Month "de" yyyy'?>
To: <? format-date:xdoxslt: get_variable($_XDOCTX, 'FechaMax');'dd "de" Month "de" yyyy'?>