Getting a timestamp and transforming to date in Drupal 8

from_timestamp_to_date_drupal_8.txt

## From a current timestamp (today) to a date
$today = DrupalDateTime::createFromTimestamp(time());

## From a current timestamp to a future date (six months ahead)
$next = DrupalDateTime::createFromTimestamp(strtotime('+6 months', time()));

## And using it to poblate a datefield within a Drupal Form (by example)
$element['nextdate'] = [
      '#type' => 'datetime',
      '#title' => t('See you'),
      '#description' => t('The next date: '),
      '#default_value' => DrupalDateTime::createFromTimestamp(strtotime('+6 months', time())),
      '#placeholder' => t('Nextdate'),
    ];

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