In the Evenflow theme, edit the file /wp-content/themes/st-even/search.php
Comment out:
<small><?php _e ('Written on', 'smpl') ?> <?php the_time('l, F jS, Y') ?> <?php _e ('at', 'smpl') ?> <?php the_time() ?> → <?php _e ('Filed under', 'smpl') ?> <?php the_category(', ') ?></small>
