diff --git a/src/Widgets/BlogArchiveWidget.php b/src/Widgets/BlogArchiveWidget.php
index 0a9b406..2c9a988 100644
--- a/src/Widgets/BlogArchiveWidget.php
+++ b/src/Widgets/BlogArchiveWidget.php
@@ -117,18 +117,18 @@ class BlogArchiveWidget extends Widget
         $query = SQLSelect::create($fields, '"BlogPost' . $suffix . '"')
             ->addGroupBy($publishDate)
             ->addOrderBy('"PublishDate" DESC')
-            ->addWhere(['"PublishDate" < ?' => DBDatetime::now()->Format(DBDatetime::ISO_DATETIME)]);
+            ->addWhere(['"PublishDate" <= ?' => DBDatetime::now()->Format(DBDatetime::ISO_DATETIME)]);
 
         $posts = $query->execute();
         $result = ArrayList::create();
-        while ($next = $posts->next()) {
+        foreach ($posts as $post) {
             if ($this->ArchiveType == 'Yearly') {
-                $year  = $next['PublishDate'];
+                $year  = $post['PublishDate'];
                 $month = null;
                 $title = $year;
             } else {
                 $date = DBDate::create();
-                $date->setValue(strtotime($next['PublishDate']));
+                $date->setValue(strtotime($post['PublishDate']));
 
                 $year  = $date->Format('y');
                 $month = $date->Format('MM');
diff --git a/tests/Widgets/BlogArchiveWidgetTest.php b/tests/Widgets/BlogArchiveWidgetTest.php
index 9f4e49e..d4520eb 100644
--- a/tests/Widgets/BlogArchiveWidgetTest.php
+++ b/tests/Widgets/BlogArchiveWidgetTest.php
@@ -22,7 +22,7 @@ class BlogArchiveWidgetTest extends SapphireTest
             $this->markTestSkipped('Test requires silverstripe/widgets to be installed.');
         }
 
-        DBDatetime::set_mock_now('2017-09-20 00:00:00');
+        DBDatetime::set_mock_now('2017-09-20 12:00:00');
 
         parent::setUp();
     }
@@ -80,4 +80,29 @@ class BlogArchiveWidgetTest extends SapphireTest
             ['Title' => '2015'],
         ], $archive);
     }
+
+    public function testArchiveMonthlyWithNewPostsAdded()
+    {
+        $original = Versioned::current_stage();
+        Versioned::reading_stage('Stage');
+
+        $widget = $this->objFromFixture('BlogArchiveWidget', 'archive-monthly');
+        $archive = $widget->getArchive();
+
+        $this->assertCount(3, $archive, 'Three months are shown in the blog archive list from fixtures');
+
+        SS_Datetime::set_mock_now('2018-01-01 12:00:00');
+
+        $newPost = new BlogPost;
+        $newPost->ParentID = $this->objFromFixture('Blog', 'my-blog')->ID;
+        $newPost->Title = 'My new blog post';
+        $newPost->PublishDate = '2018-01-01 08:00:00'; // Same day as the mocked now, but slightly earlier
+        $newPost->write();
+
+        $archive = $widget->getArchive();
+
+        $this->assertCount(4, $archive, 'Four months are shown in the blog archive list after new post added');
+
+        Versioned::reading_stage($original);
+    }
 }