Set a date field equal to "current time" + "5 minutes" using tokens I am using the Field Timer module to display countdown timer on my article node.

Say my article node has the date/time field named (field_article_datetime)

This module will take the value of the date/time field (field_article_datetime) and convert it into a countdown timer in the display of the article.

When the article node is created, I want to set the value of the date/time field (field_article_datetime) equal to current time + 5 minutes.

To extract the current time, I am using the token [node:created] from the token module, but I cannot find a solution on how to add +5 minutes to the token [node:created].

EXAMPLE:

Say at 12/03/2019 08:50:15 PM, a user has created a new article node... So I need a solution to add +5 minutes to the created time so the date/time field named (field_article_datetime) will be equal to 12/03/2019 08:55:15 PM...

This way, the user will see a countdown timer for 5 minutes on the article node display page.

Note: I am using the Business Rules module (similar to Rules module) to set the value of the date/time field (field_article_datetime) with the help of the token module.



Update #1:
Say the node is already created on the site and I want after the submission of a webform to fetch &amp; update the node with update time + 5 minutes.

I think the best Idea is to use a custom module which will do the below:


Fetch the article by nid. 
Set the value of field_article_datetime equal to: updated time + 5 * 60.
Save the Node


Since the above actions will be triggered when a user will submit a webform, so why not create a customwebformhandler.php file.

I have created a custom webform handler file but I need help to finish it since I am not a programmer:

&lt;?php

namespace Drupal\my_module_name\Plugin\WebformHandler;

use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Serialization\Yaml;
use Drupal\Core\Form\FormStateInterface;

use Drupal\node\Entity\Node;

use Drupal\webform\WebformInterface;
use Drupal\webform\Plugin\WebformHandlerBase;
use Drupal\webform\webformSubmissionInterface;
use Drupal\webform\Entity\WebformSubmission;


/**
 * Update a node entity from a webform submission.
 *
 * @WebformHandler(
 *   id = "Update a node",
 *   label = @Translation("Update a node"),
 *   category = @Translation("Entity Update"),
 *   description = @Translation("Updates a node from Webform Submissions."),
 *   cardinality = \Drupal\webform\Plugin\WebformHandlerInterface::CARDINALITY_UNLIMITED,
 *   results = \Drupal\webform\Plugin\WebformHandlerInterface::RESULTS_PROCESSED,
 *   submission = \Drupal\webform\Plugin\WebformHandlerInterface::SUBMISSION_REQUIRED,
 * )
 */

class UpdateNodeWebformHandler extends WebformHandlerBase {

  /**
   * {@inheritdoc}
   */

  // Fetch &amp; Update node object from webform-submission.

  // Function to be fired while submitting the Webform.
  public function submitForm(array &amp;$form, FormStateInterface $form_state, WebformSubmissionInterface $webform_submission) {
    // Get an array of the values from the submission.
    $values = $webform_submission-&gt;getData();

    // The webform has an element text field with machine name (update_nid) which 
    // contains the node ID of the node to be updated.
    // This is the part where to fetch the node by the value of (update_nid) element.
        Some code here

    // This is the node Updating part.
    $created = $entity-&gt;updated-&gt;value;
    date_default_timezone_set('GMT');
    $createdadd5 = date('Y-m-d\TH:i:s', $created + 5 * 60);
    $entity-&gt;field_article_datetime-&gt;value = $createdadd5;

    // This is the node Saving part.
    $node-&gt;save();
  }
}
I can't think of a solution with just tokens. Here is a quick and dirty solution without tokens

Setup your Article datetime field so that has a default relative time of +5 minutes



You can hide this field with css so the user will not change it or you can do it in a hook_form_alter function in your MODULENAME.module file

// adjust node_article_form for your content type 
if($form_id == 'node_article_form'  || $form_id == "node_article_edit_form"){
  $form["field_article_datetime"]['widget'][0]['value']['#attributes']['readonly'] = 'readonly';
}


Of course if a user takes much time to fill the form the set datetime might not reflect exactly the NODE CREATION TIME +5 minutes (as a datetime is set on form creation time) 

If the above is not good enough you can probably use hook_entity_presave to adjust the time to be EXACTLY the creation time +5 minutes.

function MODULENAME_entity_presave(Drupal\Core\Entity\EntityInterface $entity) {
  // adjust article to reflect your content type
  if ($entity-&gt;bundle() == "article" &amp;&amp; $entity-&gt;isNew()) {
    $created = $entity-&gt;created-&gt;value;
    date_default_timezone_set('GMT');
    $createdadd5 = date('Y-m-d\TH:i:s', $created + 5 * 60);
    $entity-&gt;field_article_datetime-&gt;value = $createdadd5;
  }
}


NOTE: if you want to update the timer even on node update you can just delete the &amp;&amp; $entity-&gt;isNew() part.