private com.google.protobuf.SingleFieldBuilderV3<
              com.google.protobuf.Timestamp,
              com.google.protobuf.Timestamp.Builder,
              com.google.protobuf.TimestampOrBuilder>
          getLastModifiedSinceFieldBuilder() {
        if (lastModifiedSinceBuilder_ == null) {
          lastModifiedSinceBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.protobuf.Timestamp,
                  com.google.protobuf.Timestamp.Builder,
                  com.google.protobuf.TimestampOrBuilder>(
                  getLastModifiedSince(), getParentForChildren(), isClean());
          lastModifiedSince_ = null;
        }
        return lastModifiedSinceBuilder_;
      }
<pre>
If specified, only objects with a "last modification time" on or after
this timestamp and objects that don't have a "last modification time" are
transferred.

The `last_modified_since` and `last_modified_before` fields can be used
together for chunked data processing. For example, consider a script that
processes each day's worth of data at a time. For that you'd set each
of the fields as follows:

*  `last_modified_since` to the start of the day

*  `last_modified_before` to the end of the day
</pre>

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