public void setStartDate(java.util.Date startDate) {
        this.startDate = startDate;
    }
<p>
The date when the Map Run was started.
</p>

@param startDate
       The date when the Map Run was started.
aws-java-sdk-stepfunctions/src/main/java/com/amazonaws/services/stepfunctions/model/DescribeMapRunResult.java