Store updated_at in terms as timestamp (#409)

* Store updated_at in terms as timestamp

* hmm

Author: ryanmitchell

src/Taxonomies/Term.php

@@ -38,7 +38,9 @@ public static function fromModel(Model $model)
         $term->data($data);
 
         if (config('statamic.system.track_last_update')) {
-            $term->set('updated_at', $model->updated_at ?? $model->created_at);
+            $updatedAt = ($model->updated_at ?? $model->created_at);
+
+            $term->set('updated_at', $updatedAt instanceof Carbon ? $updatedAt->timestamp : $updatedAt);
         }
 
         return $term->syncOriginal();

tests/Terms/TermTest.php

@@ -29,4 +29,22 @@ public function it_doesnt_create_a_new_model_when_slug_is_changed()
         $this->assertCount(1, TermModel::all());
         $this->assertSame('new-slug', TermModel::first()->slug);
     }
+
+    #[Test]
+    public function it_saves_updated_at_value_correctly()
+    {
+        $this->freezeSecond();
+
+        Taxonomy::make('test')->title('test')->save();
+
+        tap(TermFacade::make('test-term')->taxonomy('test')->data([]))->save();
+
+        /** @var LocalizedTerm $term */
+        $term = TermFacade::query()->first();
+        $term->set('foo', 'bar');
+        $term->save();
+
+        $this->assertEquals(now(), $term->updated_at);
+        $this->assertEquals(now(), TermFacade::query()->first()->updated_at);
+    }
 }