I'm trying to show a message for specific content type through a new module, on Drupal 8.3.0. (I'm a beginner.) This is part of the code I am using. ### File test_module.module (updated code, still not working) /** * @file * Implementation of hook_node_view(); */ function test_module_node_view($node, $view_mode) { if ($view_mode == 'full' && $node->type == 'test_content') { /*Message with current date and time*/ $current_time = time(); drupal_set_message(t('Hello! Today is '.format_date($current_time,'medium'))); } } As far as I know, this should work, but it doesn't and I don't know why. The message is not showing for a node of content type "test_content". How can I fix this? Is there another way to alter nodes of custom content types? > [![screenshot][1]][1] <!-- break --> > [![screenshot][2]][2] (Test_content_example is a node of type 'test_content', so there should be a system message displayed, but there's none.) [1]: https://i.sstatic.net/QB9vg.png [2]: https://i.sstatic.net/ml7Tx.png