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

@param optimizationStartTime
       The time when the optimization job started.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-sagemaker/src/main/java/com/amazonaws/services/sagemaker/model/OptimizationJobSummary.java