How can I remove only submitted time from node view?
Step 1->create a custom date format go to "admin/config/regional/date-time" then click "Add format" link,give appropriate name, in my case i have taken name "new custom", in format string input "l,F d, Y" then save.

Step 2->In your Your_theme.theme file write the preprocess function for node:

function Your_theme_preprocess_node(&amp;$variables) {
// Getting the node creation time stamp from the node object.
  $date = $variables['node']-&gt;getCreatedTime();
// Here you can use drupal's format_date() function, or some custom PHP date formatting.
 $variables['date_custom'] = \Drupal::service('date.formatter')-
 &gt;format($date, 'Machine_name_of_created_date_format'); //In my case machine name was "new_custom"
   }


Step 3->Create a twig template of your content type like node--your-content-machine-name.html.twig 

replace the following line :
{% trans %}Submitted by {{ author_name }} on {{ date }}{% endtrans %}

with

{% trans %}Submitted by {{ author_name }} on {{ date_custom }}{% endtrans %}