ibatis.net datetime and dynamic sql -

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how can test if property of type datetime contains value on dynamic sql statement ibatis.net mapping file follow, not work

<select id="select" resultmap ="congeresult" parameterclass="conge">   select * conge   <dynamic prepend="where">     <isgreaterthan property="startdate" comparevalue="01/01/0001 00:00:00">       start_date >= #startdate#     </isgreaterthan>           </dynamic> </select>

thanks in advance.

try specifying date/time value in iso 8601 format http://en.wikipedia.org/wiki/iso_8601. parsers correctly parse string representation. value parsed if type: 

comparevalue="0001-01-01 00:00:00"

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