X++ code to get the time and add and substract using the current date time in D365 F&O

 utcdatetime dateTime = DateTimeUtil::getSystemDateTime();//DateTimeUtil::utcNow();

        utcdatetime newDateTime = DateTimeUtil::addMinutes(dateTime, -20);

        Info(strFmt("Current time: %1 redueced Time: %2 ",dateTime,newDateTime));