private com.google.protobuf.SingleFieldBuilderV3<
            com.google.protobuf.Timestamp,
            com.google.protobuf.Timestamp.Builder,
            com.google.protobuf.TimestampOrBuilder>
        getJobStartTimeFieldBuilder() {
      if (jobStartTimeBuilder_ == null) {
        jobStartTimeBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.protobuf.Timestamp,
                com.google.protobuf.Timestamp.Builder,
                com.google.protobuf.TimestampOrBuilder>(
                getJobStartTime(), getParentForChildren(), isClean());
        jobStartTime_ = null;
      }
      return jobStartTimeBuilder_;
    }
<pre>
The start timestamp of the job in UTC time zone. Typically this field
is used for contracting engagements. Invalid timestamps are ignored.
</pre>

<code>.google.protobuf.Timestamp job_start_time = 22;</code>
java-talent/proto-google-cloud-talent-v4/src/main/java/com/google/cloud/talent/v4/Job.java