FeatureSource fs = dataStore.getFeatureSource( tname("dates") );
FilterFactory ff = dataStore.getFilterFactory();
// greather than or equal to
Filter f = ff.greaterOrEqual( ff.property( aname("t") ), ff.literal( "13:10:12" ) );
assertEquals( 3, fs.getCount( new DefaultQuery(tname("dates"),f ) ) );
f = ff.greaterOrEqual( ff.property( aname("t") ),
ff.literal( new SimpleDateFormat("ss:HH:mm").parse("12:13:10") ) );
assertEquals( 3, fs.getCount( new DefaultQuery(tname("dates"),f ) ) );