Haven't see the date function. Is that something you wrote? Anyway this will do what you want:
dt = New Table( "Sample Table",
Add Rows( 4 ),
New Column( "Date Data Ran",
Numeric,
Continuous,
Format( "d/m/y", 12 ),
Input Format( "d/m/y" ),
Set Values( [3482092800, 3484771200, 3487363200, 3482092800] )
)
);
search_date = informat("05/05/2014", "d/m/y");
del_rows = dt << get rows where(:Date Data Ran == search_date);
dt << delete rows(del_rows);