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

@param startTimestamp
       The time when the execution was started.
aws-java-sdk-simpleworkflow/src/main/java/com/amazonaws/services/simpleworkflow/model/WorkflowExecutionInfo.java