add_action( 'pre_get_posts', 'my_post_queries1' );

	function my_post_queries1( $query ) {

		// not an admin page and is the main query
		if ( !is_admin() && $query->is_main_query() ) {

			// only alter the query on the home page
			if ( is_home() ) {

				// change these two values
				$dates_per_page = 4; // four dates to loop through (dates can have multiple posts)
				$top_category_id = 1; // category you want on top of same date posts

				$all_posts = array();
				$results = get_dates( $dates_per_page );

				if ( $results ) {

					$date_sorted = array();
					$i = 0;

					// loop through dates
					foreach ( $results as $result ) {

						$args = array(
						  'posts_per_page' => -1,
						  'year'           => $result->year,
						  'monthnum'       => $result->month,
						  'day'            => $result->dayofmonth,
						  'fields'         => 'ids'
						);

						$date_posts = get_posts($args);

						if ( $date_posts ) {

							// sort date posts by category
							foreach ( $date_posts as $post_id ) {

								if ( is_object_in_term( $post_id, 'category', $top_category_id ) ) {
									$date_sorted[$i]['first'][] = $post_id;
								} else {
									$date_sorted[$i]['last'][] = $post_id;
								}
							}
						}
						++$i;
					} // endforeach ( $results as $result )


					// all post IDs with category test on top
					foreach ( $date_sorted as $key => $date ) {

						if ( isset( $date['first'] )) {
							$all_posts = array_merge($all_posts, $date['first'] );
						}
						if ( isset( $date['last'] )) {
							$all_posts = array_merge($all_posts, $date['last'] );
						}
					}

					// don't use default pagination
					$query->set( 'nopaging', 1 );
					$query->set( 'posts_per_page', count($all_posts) );
					$query->set( 'post__in', $all_posts );
					$query->set( 'orderby', 'post__in' );
					$query->set( 'ignore_sticky_posts', 1 );

				} else {

					// if no results found don't query for posts
					add_filter( 'posts_where', 'alter_posts_where' );

				} // end if($results)
			}
		}
	}


	function alter_posts_where( $where ){
		return $where . ' AND 1 = 0';
	}


	function get_dates( $dates_per_page, $limit = '' ) {

		$paged = ( get_query_var('paged') ) ? get_query_var('paged') : 1;

		if( '' == $limit ) {
			$limit = ' LIMIT ' . (($paged -1) * $dates_per_page) . ',' . $dates_per_page;
		}

		global $wpdb;
		$where = "WHERE post_type = 'post' AND post_status = 'publish'";
		$query = "SELECT YEAR(post_date) AS `year`, MONTH(post_date) AS `month`, DAYOFMONTH(post_date) AS `dayofmonth`, count(ID) as posts FROM $wpdb->posts $where GROUP BY YEAR(post_date), MONTH(post_date), DAYOFMONTH(post_date) ORDER BY post_date DESC $limit";

		return $wpdb->get_results( $query );
	}


	function next_date_link( $dates_per_page = 10, $label = 'Next Page' ){
		return previous_date_link( $dates_per_page, $label, false );
	}


	function previous_date_link( $dates_per_page = 10, $label = 'Previous Page', $prev = true ){

		$paged = ( get_query_var('paged') ) ? get_query_var('paged') : 1;

		if ( $prev ) {

			$count = (($paged -1) * $dates_per_page) + $dates_per_page;
			$limit = ' LIMIT ' . $count . ', 1';

		} else {

			$count = (($paged -1) * $dates_per_page)-1;

			if ( ($count+1) < $dates_per_page )
				return '';

			$limit = ' LIMIT ' . $count . ', 1';

		}

		$results = get_dates( $dates_per_page, $limit );

		if ( $results ) {
			$pagenum = ( $prev ) ? ($paged+1) : ($paged-1);
			return '<a href="' . get_pagenum_link( $pagenum ) . '" >' .  $label . '</a>';
		}

		return '';
	}