@java.lang.Override
    public Builder toBuilder() {
        return this == DEFAULT_INSTANCE
                ? new Builder()
                : new Builder().mergeFrom(this);
    }
<code>optional int64 last_updated_date = 2;</code>

@return The lastUpdatedDate.
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/model/common/StringsWithVersion.java