Hi Briesmi,
you can get the human readable time format by using a wordpress function available. human_time_diff
You can make this changes by redefining the function “athemes_posted_on” in your child theme’s functions.php file.
function athemes_posted_on() {
$time_string = '<time class="entry-date published" datetime="%1$s">%2$s</time>';
//if ( get_the_time( 'U' ) !== get_the_modified_time( 'U' ) )
//$time_string .= '<time class="updated" datetime="%3$s">%4$s</time>';
$time_string = sprintf( $time_string,
esc_attr( get_the_date( 'c' ) ),
esc_html( human_time_diff( get_the_date( 'U' ) ) . ' ago' ),
esc_attr( get_the_modified_date( 'c' ) ),
esc_html( get_the_modified_date() )
);
printf( __( '<span class="posted-on">Posted on %1$s</span><span class="byline"> by %2$s</span>', 'athemes' ),
sprintf( '<a href="%1$s" title="%2$s" rel="bookmark">%3$s</a>',
esc_url( get_permalink() ),
esc_attr( get_the_time() ),
$time_string
),
sprintf( '<span class="author vcard"><a class="url fn n" href="%1$s" title="%2$s">%3$s</a></span>',
esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
esc_attr( sprintf( __( 'View all posts by %s', 'athemes' ), get_the_author() ) ),
esc_html( get_the_author() )
)
);
}
Also i see you have been using verion 3.8.3. I will suggest you to keep your site updated with the latest.