@Override
    protected Object execute(Object data, State state) {
        if (data == null) {
            return ZoneOffset.systemDefault().getRules().getOffset(Instant.now()).getId();
        }
        return getTimeZone(data.toString());
    }
Executor class for retrieving the timezone from a string timeStamp.
modules/siddhi-core/src/main/java/io/siddhi/core/executor/incremental/IncrementalTimeGetTimeZone.java