Magento 2 convert current date time to gmtdate

How to convert current timezone date and time to gmtdate and time ?

Here I am adding some hours for todays date and wants to convert in gmtdate to filter order colleciton

//MagentoFrameworkStdlibDateTimeTimezoneInterface

echo $toDay = $this->timezone->date()->format('Y-m-d H:i');

  $fromTime = strtotime($toDay);
  $toTime = $fromTime + 3600;

This below code gives current timezone time by adding one hour but I want to convert in gmt date and time

echo date('Y-m-d h:i', $toTime);