How to use utc timestamp in symfony 4??

@herminia_bruen 

In Symfony 4, you can use the DateTime class to work with UTC timestamps. Here's how you can do it:

1. Get the current UTC timestamp:

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$currentTime = new DateTime('now', new DateTimeZone('UTC'));
$timestamp = $currentTime->getTimestamp();

1. Convert a timestamp to a UTC date:

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$timestamp = 1611949110; // Example timestamp
$dateTime = new DateTime('@' . $timestamp);
$dateTime->setTimezone(new DateTimeZone('UTC'));
$utcDate = $dateTime->format('Y-m-d H:i:s');

1. You can also configure Symfony to use UTC as the default timezone application-wide by setting the timezone in your config/packages/framework.yaml file:

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framework:
    default_timezone: "UTC"

By following these steps, you can easily work with UTC timestamps in Symfony 4.