public com.google.protobuf.Timestamp.Builder getStartTimeBuilder() {
      bitField0_ |= 0x00000004;
      onChanged();
      return getStartTimeFieldBuilder().getBuilder();
    }
<pre>
The time the replication cycle has started.
</pre>

<code>.google.protobuf.Timestamp start_time = 1;</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/ReplicationCycle.java