public CostAllocationTagBackfillRequest withCompletedAt(String completedAt) {
        setCompletedAt(completedAt);
        return this;
    }
<p>
The backfill completion time.
</p>

@param completedAt
       The backfill completion time.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-costexplorer/src/main/java/com/amazonaws/services/costexplorer/model/CostAllocationTagBackfillRequest.java