diff --git a/extensions/mentions/migrations/2022_05_20_000005_add_created_at_to_post_mentions_post_table.php b/extensions/mentions/migrations/2022_05_20_000005_add_created_at_to_post_mentions_post_table.php
new file mode 100644
index 000000000..1acd6988f
--- /dev/null
+++ b/extensions/mentions/migrations/2022_05_20_000005_add_created_at_to_post_mentions_post_table.php
@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder;
+
+return [
+    'up' => function (Builder $schema) {
+        $schema->table('post_mentions_post', function (Blueprint $table) {
+            $table->timestamp('created_at')->nullable();
+        });
+
+        // do this manually because dbal doesn't recognize timestamp columns
+        $connection = $schema->getConnection();
+        $prefix = $connection->getTablePrefix();
+        $connection->statement("ALTER TABLE `${prefix}post_mentions_post` MODIFY created_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP");
+    },
+
+    'down' => function (Builder $schema) {
+        $schema->table('post_mentions_post', function (Blueprint $table) {
+            $table->dropColumn('created_at');
+        });
+    }
+];
diff --git a/extensions/mentions/migrations/2022_05_20_000006_add_created_at_to_post_mentions_user_table.php b/extensions/mentions/migrations/2022_05_20_000006_add_created_at_to_post_mentions_user_table.php
new file mode 100644
index 000000000..0a1e2eb2a
--- /dev/null
+++ b/extensions/mentions/migrations/2022_05_20_000006_add_created_at_to_post_mentions_user_table.php
@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder;
+
+return [
+    'up' => function (Builder $schema) {
+        $schema->table('post_mentions_user', function (Blueprint $table) {
+            $table->timestamp('created_at')->nullable();
+        });
+
+        // do this manually because dbal doesn't recognize timestamp columns
+        $connection = $schema->getConnection();
+        $prefix = $connection->getTablePrefix();
+        $connection->statement("ALTER TABLE `${prefix}post_mentions_user` MODIFY created_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP");
+    },
+
+    'down' => function (Builder $schema) {
+        $schema->table('post_mentions_user', function (Blueprint $table) {
+            $table->dropColumn('created_at');
+        });
+    }
+];
diff --git a/extensions/tags/migrations/2022_05_20_000003_add_timestamps_to_tags_table.php b/extensions/tags/migrations/2022_05_20_000003_add_timestamps_to_tags_table.php
new file mode 100644
index 000000000..db96c2735
--- /dev/null
+++ b/extensions/tags/migrations/2022_05_20_000003_add_timestamps_to_tags_table.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder;
+
+return [
+    'up' => function (Builder $schema) {
+        $schema->table('tags', function (Blueprint $table) {
+            $table->timestamp('created_at')->nullable();
+            $table->timestamp('updated_at')->nullable();
+        });
+
+        // do this manually because dbal doesn't recognize timestamp columns
+        $connection = $schema->getConnection();
+        $prefix = $connection->getTablePrefix();
+        $connection->statement("ALTER TABLE `${prefix}tags` MODIFY created_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP");
+        $connection->statement("ALTER TABLE `${prefix}tags` MODIFY updated_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP");
+    },
+
+    'down' => function (Builder $schema) {
+        $schema->table('tags', function (Blueprint $table) {
+            $table->dropColumn('created_at');
+            $table->dropColumn('updated_at');
+        });
+    }
+];
diff --git a/extensions/tags/migrations/2022_05_20_000004_add_created_at_to_discussion_tag_table.php b/extensions/tags/migrations/2022_05_20_000004_add_created_at_to_discussion_tag_table.php
new file mode 100644
index 000000000..eca2085f8
--- /dev/null
+++ b/extensions/tags/migrations/2022_05_20_000004_add_created_at_to_discussion_tag_table.php
@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder;
+
+return [
+    'up' => function (Builder $schema) {
+        $schema->table('discussion_tag', function (Blueprint $table) {
+            $table->timestamp('created_at')->nullable();
+        });
+
+        // do this manually because dbal doesn't recognize timestamp columns
+        $connection = $schema->getConnection();
+        $prefix = $connection->getTablePrefix();
+        $connection->statement("ALTER TABLE `${prefix}discussion_tag` MODIFY created_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP");
+    },
+
+    'down' => function (Builder $schema) {
+        $schema->table('discussion_tag', function (Blueprint $table) {
+            $table->dropColumn('created_at');
+        });
+    }
+];
diff --git a/extensions/tags/src/Tag.php b/extensions/tags/src/Tag.php
index b83460adf..202a54a1b 100644
--- a/extensions/tags/src/Tag.php
+++ b/extensions/tags/src/Tag.php
@@ -42,7 +42,12 @@ class Tag extends AbstractModel
 
     protected $table = 'tags';
 
-    protected $dates = ['last_posted_at'];
+    /**
+     * The attributes that should be mutated to dates.
+     *
+     * @var array
+     */
+    protected $dates = ['last_posted_at', 'created_at', 'updated_at'];
 
     protected $casts = [
         'is_hidden' => 'bool',
diff --git a/framework/core/migrations/2022_05_20_000000_add_timestamps_to_groups_table.php b/framework/core/migrations/2022_05_20_000000_add_timestamps_to_groups_table.php
new file mode 100644
index 000000000..bab2b4a57
--- /dev/null
+++ b/framework/core/migrations/2022_05_20_000000_add_timestamps_to_groups_table.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder;
+
+return [
+    'up' => function (Builder $schema) {
+        $schema->table('groups', function (Blueprint $table) {
+            $table->timestamp('created_at')->nullable();
+            $table->timestamp('updated_at')->nullable();
+        });
+
+        // do this manually because dbal doesn't recognize timestamp columns
+        $connection = $schema->getConnection();
+        $prefix = $connection->getTablePrefix();
+        $connection->statement("ALTER TABLE `${prefix}groups` MODIFY created_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP");
+        $connection->statement("ALTER TABLE `${prefix}groups` MODIFY updated_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP");
+    },
+
+    'down' => function (Builder $schema) {
+        $schema->table('groups', function (Blueprint $table) {
+            $table->dropColumn('created_at');
+            $table->dropColumn('updated_at');
+        });
+    }
+];
diff --git a/framework/core/migrations/2022_05_20_000001_add_created_at_to_group_user_table.php b/framework/core/migrations/2022_05_20_000001_add_created_at_to_group_user_table.php
new file mode 100644
index 000000000..36bf77265
--- /dev/null
+++ b/framework/core/migrations/2022_05_20_000001_add_created_at_to_group_user_table.php
@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder;
+
+return [
+    'up' => function (Builder $schema) {
+        $schema->table('group_user', function (Blueprint $table) {
+            $table->timestamp('created_at')->nullable();
+        });
+
+        // do this manually because dbal doesn't recognize timestamp columns
+        $connection = $schema->getConnection();
+        $prefix = $connection->getTablePrefix();
+        $connection->statement("ALTER TABLE `${prefix}group_user` MODIFY created_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP");
+    },
+
+    'down' => function (Builder $schema) {
+        $schema->table('group_user', function (Blueprint $table) {
+            $table->dropColumn('created_at');
+        });
+    }
+];
diff --git a/framework/core/migrations/2022_05_20_000002_add_created_at_to_group_permission_table.php b/framework/core/migrations/2022_05_20_000002_add_created_at_to_group_permission_table.php
new file mode 100644
index 000000000..1333128f2
--- /dev/null
+++ b/framework/core/migrations/2022_05_20_000002_add_created_at_to_group_permission_table.php
@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder;
+
+return [
+    'up' => function (Builder $schema) {
+        $schema->table('group_permission', function (Blueprint $table) {
+            $table->timestamp('created_at')->nullable();
+        });
+
+        // do this manually because dbal doesn't recognize timestamp columns
+        $connection = $schema->getConnection();
+        $prefix = $connection->getTablePrefix();
+        $connection->statement("ALTER TABLE `${prefix}group_permission` MODIFY created_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP");
+    },
+
+    'down' => function (Builder $schema) {
+        $schema->table('group_permission', function (Blueprint $table) {
+            $table->dropColumn('created_at');
+        });
+    }
+];
diff --git a/framework/core/src/Group/Group.php b/framework/core/src/Group/Group.php
index b64a1ed26..6275a84c1 100644
--- a/framework/core/src/Group/Group.php
+++ b/framework/core/src/Group/Group.php
@@ -52,6 +52,13 @@ class Group extends AbstractModel
      */
     const MODERATOR_ID = 4;
 
+    /**
+     * The attributes that should be mutated to dates.
+     *
+     * @var array
+     */
+    protected $dates = ['created_at', 'updated_at'];
+
     /**
      * Boot the model.
      *
diff --git a/framework/core/src/Group/Permission.php b/framework/core/src/Group/Permission.php
index 7e5135a47..09ec03491 100644
--- a/framework/core/src/Group/Permission.php
+++ b/framework/core/src/Group/Permission.php
@@ -23,6 +23,13 @@ class Permission extends AbstractModel
      */
     protected $table = 'group_permission';
 
+    /**
+     * The attributes that should be mutated to dates.
+     *
+     * @var array
+     */
+    protected $dates = ['created_at'];
+
     /**
      * Define the relationship with the group that this permission is for.
      *