@Nullable public static String dateToStringUTC(@Nullable Date date,@NonNull DateFormat df){
  if (date == null) {
    return null;
  }
 else {
    df.setTimeZone(UTC);
    return dateToString(date,df);
  }
}

@ Nullable public static String dateToStringUTC ( @ Nullable Date date , @ NonNull DateFormat df ) { if ( date == null ) { return null ; } else { df . setTimeZone ( UTC ) ; return dateToString ( date , df ) ; } }
converts a date object to a string representation in utc
