wp_query, first post, last post

gistfile1.aw

function time_first_post() {
	global $wp_query;
	return ( in_the_loop() && $wp_query->current_post == 0 );
}

function time_last_post() {
	global $wp_query;
	return ( in_the_loop() && $wp_query->current_post == $wp_query->post_count-1 );
}

$query = new WP_Query( $args );

global $wp_query;
		$wp_query = $query;
		
		if( have_posts() ) {
			while( have_posts() ) : the_post(); ?>

				<?php if( time_first_post() ) : ?>
					<h1><?php the_title(); ?></h1>
					<?php else : ?>
					<h4><?php the_title(); ?></h4>
				<?php endif; ?>
				
			<?php endwhile;
		}
		
		wp_reset_query();