public InstanceEventWindowTimeRangeRequest withStartWeekDay(String startWeekDay) {
        setStartWeekDay(startWeekDay);
        return this;
    }
<p>
The day on which the time range begins.
</p>

@param startWeekDay
       The day on which the time range begins.
@return Returns a reference to this object so that method calls can be chained together.
@see WeekDay
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/InstanceEventWindowTimeRangeRequest.java