public Builder setStartOffset(com.google.protobuf.Duration value) {
        if (startOffsetBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          startOffset_ = value;
        } else {
          startOffsetBuilder_.setMessage(value);
        }
        bitField0_ |= 0x00000001;
        onChanged();
        return this;
      }
<pre>
Start time offset of the partition.
</pre>

<code>.google.protobuf.Duration start_offset = 1;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/Partition.java