public void setOptimizationStartTime(java.util.Date optimizationStartTime) {
        this.optimizationStartTime = optimizationStartTime;
    }
<p>
The time when the optimization job started.
</p>

@param optimizationStartTime
       The time when the optimization job started.
aws-java-sdk-sagemaker/src/main/java/com/amazonaws/services/sagemaker/model/OptimizationJobSummary.java