public Builder mergeEndTime(com.google.protobuf.Timestamp value) {
        if (endTimeBuilder_ == null) {
          if (((bitField0_ & 0x00000040) != 0)
              && endTime_ != null
              && endTime_ != com.google.protobuf.Timestamp.getDefaultInstance()) {
            getEndTimeBuilder().mergeFrom(value);
          } else {
            endTime_ = value;
          }
        } else {
          endTimeBuilder_.mergeFrom(value);
        }
        if (endTime_ != null) {
          bitField0_ |= 0x00000040;
          onChanged();
        }
        return this;
      }
<pre>
End time of this transfer execution.
</pre>

<code>.google.protobuf.Timestamp end_time = 5;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java