public WorkflowExecutionInfo withStartTimestamp(java.util.Date startTimestamp) {
        setStartTimestamp(startTimestamp);
        return this;
    }
<p>
The time when the execution was started.
</p>

@param startTimestamp
       The time when the execution was started.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-simpleworkflow/src/main/java/com/amazonaws/services/simpleworkflow/model/WorkflowExecutionInfo.java