diff --git a/db/migrate/20150615215500_alter_column_articles_start_date.rb b/db/migrate/20150615215500_alter_column_articles_start_date.rb
new file mode 100644
index 0000000..eef2e79
--- /dev/null
+++ b/db/migrate/20150615215500_alter_column_articles_start_date.rb
@@ -0,0 +1,13 @@
+class AlterColumnArticlesStartDate < ActiveRecord::Migration
+  def up
+    change_table :articles do |t|
+      t.change :start_date, :datetime
+    end
+  end
+
+  def down
+    change_table :articles do |t|
+      t.change :start_date, :date
+    end
+  end
+end
diff --git a/db/migrate/20150615215658_alter_column_articles_end_date.rb b/db/migrate/20150615215658_alter_column_articles_end_date.rb
new file mode 100644
index 0000000..e410904
--- /dev/null
+++ b/db/migrate/20150615215658_alter_column_articles_end_date.rb
@@ -0,0 +1,13 @@
+class AlterColumnArticlesEndDate < ActiveRecord::Migration
+  def up
+    change_table :articles do |t|
+      t.change :end_date, :datetime
+    end
+  end
+
+  def down
+    change_table :articles do |t|
+      t.change :end_date, :date
+    end
+  end
+end
diff --git a/db/migrate/20150615222147_alter_column_article_versions_end_date.rb b/db/migrate/20150615222147_alter_column_article_versions_end_date.rb
new file mode 100644
index 0000000..733ce28
--- /dev/null
+++ b/db/migrate/20150615222147_alter_column_article_versions_end_date.rb
@@ -0,0 +1,13 @@
+class AlterColumnArticleVersionsEndDate < ActiveRecord::Migration
+  def up
+    change_table :article_versions do |t|
+      t.change :end_date, :datetime
+    end
+  end
+
+  def down
+    change_table :article_versions do |t|
+      t.change :end_date, :date
+    end
+  end
+end
diff --git a/db/migrate/20150615222204_alter_column_article_versions_start_date.rb b/db/migrate/20150615222204_alter_column_article_versions_start_date.rb
new file mode 100644
index 0000000..311aff1
--- /dev/null
+++ b/db/migrate/20150615222204_alter_column_article_versions_start_date.rb
@@ -0,0 +1,13 @@
+class AlterColumnArticleVersionsStartDate < ActiveRecord::Migration
+  def up
+    change_table :article_versions do |t|
+      t.change :start_date, :datetime
+    end
+  end
+
+  def down
+    change_table :article_versions do |t|
+      t.change :start_date, :date
+    end
+  end
+end
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--
libgit2 0.21.2