Index: wp-admin/includes/export.php
===================================================================
--- wp-admin/includes/export.php	(revision 13420)
+++ wp-admin/includes/export.php	(working copy)
@@ -23,22 +23,43 @@
  *
  * @param unknown_type $author
  */
-function export_wp($author='') {
+function export_wp($author='', $category='', $post_type='', $status='', $start_date='', $end_date='') {
 global $wpdb, $post_ids, $post, $wp_taxonomies;
 
 do_action('export_wp');
 
-$filename = 'wordpress.' . date('Y-m-d') . '.xml';
+if(strlen($start_date) > 4 && strlen($end_date) > 4) {
+	$filename = 'wordpress.' . $start_date . '.' . $end_date . '.xml';
+} else {
+	$filename = 'wordpress.' . date('Y-m-d') . '.xml';
+}
 
 header('Content-Description: File Transfer');
 header("Content-Disposition: attachment; filename=$filename");
 header('Content-Type: text/xml; charset=' . get_option('blog_charset'), true);
 
-$where = '';
-if ( $author and $author != 'all' ) {
-	$author_id = (int) $author;
-	$where = $wpdb->prepare(" WHERE post_author = %d ", $author_id);
-}
+if ( $post_type and $post_type != 'all' ) { 
+		$where = $wpdb->prepare("WHERE post_type = %s ", $post_type); 
+} else { 
+		$where = "WHERE post_type != 'revision' "; 
+} 
+if ( $author and $author != 'all' ) { 
+		$author_id = (int) $author; 
+		$where .= $wpdb->prepare("AND post_author = %d ", $author_id); 
+} 
+if ( $start_date and $start_date != 'all' ) { 
+		$where .= $wpdb->prepare("AND post_date >= %s ", $start_date); 
+} 
+if ( $end_date and $end_date != 'all' ) { 
+		$where .= $wpdb->prepare("AND post_date < %s ", $end_date); 
+} 
+if ( $category and $category != 'all' ) { 
+		$taxomony_id = (int) $category; 
+		$where .= $wpdb->prepare("AND ID IN (SELECT object_id FROM {$wpdb->term_relationships} " . "WHERE term_taxonomy_id = %d) ", $taxomony_id); 
+} 
+if ( $status and $status != 'all' ) { 
+		$where .= $wpdb->prepare("AND post_status = %s ", $status); 
+} 
 
 // grab a snapshot of post IDs, just in case it changes during the export
 $post_ids = $wpdb->get_col("SELECT ID FROM $wpdb->posts $where ORDER BY post_date_gmt ASC");
@@ -300,9 +321,6 @@
 			$where = "WHERE ID IN (".join(',', $next_posts).")";
 			$posts = $wpdb->get_results("SELECT * FROM $wpdb->posts $where ORDER BY post_date_gmt ASC");
 				foreach ($posts as $post) {
-			// Don't export revisions.  They bloat the export.
-			if ( 'revision' == $post->post_type )
-				continue;
 			setup_postdata($post);
 
 			$is_sticky = 0;
Index: wp-admin/export.php
===================================================================
--- wp-admin/export.php	(revision 13420)
+++ wp-admin/export.php	(working copy)
@@ -17,14 +17,42 @@
 $title = __('Export');
 
 if ( isset( $_GET['download'] ) ) {
-	$author = isset($_GET['author']) ? $_GET['author'] : 'all';
-	export_wp( $author );
+		$author = isset($_GET['author']) ? $_GET['author'] : 'all';
+		$category = isset($_GET['category']) ? $_GET['category'] : 'all';
+		$post_type = isset($_GET['post_type']) ? wp_specialchars($_GET['post_type']) : 'all';
+		$status = isset($_GET['status']) ? wp_specialchars($_GET['status']) : 'all';
+		$mm_start = isset($_GET['mm_start']) ? $_GET['mm_start'] : 'all';
+		$mm_end = isset($_GET['mm_end']) ? $_GET['mm_end'] : 'all';
+		$aa_start = isset($_GET['aa_start']) ? intval($_GET['aa_start']) : 0;
+		$aa_end = isset($_GET['aa_end']) ? intval($_GET['aa_end']) : 0;
+		if($mm_start != 'all' && $aa_start > 0) {
+			$start_date = sprintf( "%04d-%02d-%02d", $aa_start, $mm_start, 1 );
+		} else {
+			$start_date = 'all';
+		}
+		if($mm_end != 'all' && $aa_end > 0) {
+			if($mm_end == 12) {
+				$mm_end = 1;
+				$aa_end++;
+			} else {
+				$mm_end++;
+			}
+			$end_date = sprintf( "%04d-%02d-%02d", $aa_end, $mm_end, 1 );
+		} else {
+			$end_date = 'all';
+		}
+	export_wp( $author, $category, $post_type, $status, $start_date, $end_date );
 	die();
 }
 
 require_once ('admin-header.php');
-?>
 
+$months = "";
+for ( $i = 1; $i < 13; $i++ ) {
+	$months .= "\t\t\t<option value=\"" . zeroise($i, 2) . '">' . 
+		$wp_locale->get_month_abbrev( $wp_locale->get_month( $i ) ) . "</option>\n";
+} ?>
+
 <div class="wrap">
 <?php screen_icon(); ?>
 <h2><?php echo esc_html( $title ); ?></h2>
@@ -37,6 +65,23 @@
 
 <table class="form-table">
 <tr>
+<th><label for="mm_start"><?php _e('Restrict Date'); ?></label></th>
+<td><strong><?php _e('Start:'); ?></strong> <?php _e('Month'); ?>&nbsp;
+<select name="mm_start" id="mm_start">
+<option value="all" selected="selected"><?php _e('All Dates'); ?></option>
+<?php echo $months; ?>
+</select>&nbsp;<?php _e('Year'); ?>&nbsp;
+<input type="text" id="aa_start" name="aa_start" value="" size="4" maxlength="5" />
+</td>
+<td><strong><?php _e('End:'); ?></strong> <?php _e('Month'); ?>&nbsp;
+<select name="mm_end" id="mm_end">
+<option value="all" selected="selected"><?php _e('All Dates'); ?></option>
+<?php echo $months; ?>
+</select>&nbsp;<?php _e('Year'); ?>&nbsp;
+<input type="text" id="aa_end" name="aa_end" value="" size="4" maxlength="5" />
+</td>
+</tr>
+<tr>
 <th><label for="author"><?php _e('Restrict Author'); ?></label></th>
 <td>
 <select name="author" id="author">
@@ -45,12 +90,50 @@
 $authors = $wpdb->get_col( "SELECT post_author FROM $wpdb->posts GROUP BY post_author" );
 foreach ( $authors as $id ) {
 	$o = get_userdata( $id );
-	echo "<option value='" . esc_attr($o->ID) . "'>$o->display_name</option>";
+	echo "<option value='{$o->ID}'>{$o->display_name}</option>\n";
 }
 ?>
 </select>
 </td>
 </tr>
+<tr>
+<th><label for="category"><?php _e('Restrict Category'); ?></label></th>
+<td>
+<select name="category" id="category">
+<option value="all" selected="selected"><?php _e('All Categories'); ?></option>
+<?php
+$categories = (array) get_categories('get=all');
+if($categories) {
+	foreach ( $categories as $cat ) {
+		echo "<option value='{$cat->term_taxonomy_id}'>{$cat->name}</option>\n";
+	}
+}
+?>
+</select>
+</td>
+</tr>
+<tr>
+<th><label for="post_type"><?php _e('Restrict Content'); ?></label></th>
+<td>
+<select name="post_type" id="post_type">
+<option value="all" selected="selected"><?php _e('All Content'); ?></option>
+<option value="page"><?php _e('Pages'); ?></option>
+<option value="post"><?php _e('Posts'); ?></option>
+</select>
+</td>
+</tr>
+<tr>
+<th><label for="status"><?php _e('Restrict Status'); ?></label></th>
+<td>
+<select name="status" id="status">
+<option value="all" selected="selected"><?php _e('All Statuses'); ?></option>
+<option value="draft"><?php _e('Draft'); ?></option>
+<option value="private"><?php _e('Privately published'); ?></option>
+<option value="publish"><?php _e('Published'); ?></option>
+<option value="future"><?php _e('Scheduled'); ?></option>
+</select>
+</td>
+</tr>
 </table>
 <p class="submit"><input type="submit" name="submit" class="button" value="<?php esc_attr_e('Download Export File'); ?>" />
 <input type="hidden" name="download" value="true" />