useTimezone=true
serverTimezone=UTC
useLegacyDatetimeCode=false

jdbc:mysql://hostname/databaseName?useTimezone=true&serverTimezone=UTC&useLegacyDatetimeCode=false

@Type(type="org.jadira.usertype.dateandtime.joda.PersistentDateTime",
    parameters = { @Parameter(name = "databaseZone", value = "UTC")})
private DateTime dateTime;

<property name="hibernate.jdbc.time_zone" value="UTC"/>

TimeZone.setDefault(TimeZone.getTimeZone("Etc/UTC"));

Date localTime = getDateFromDB();
String format = "yyyy/MM/dd HH:mm:ss";
SimpleDateFormat sdf = new SimpleDateFormat(format);

sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
Date gmtTime = new Date(sdf.format(localTime));