public DateFuncSup subtract(DateSeperator d) {
                date.setTime(date.getTime() - d.parse());
                return this;
        }
public DateFuncSup subtract ( DateSeperator d ) { date . setTime ( date . getTime ( ) - d . parse ( ) ) ; return this ; }
subtract date on supported date

@param d date to subtract
@return <code>this</code>