public Builder clearJobStartTime() {
      bitField0_ = (bitField0_ & ~0x00200000);
      jobStartTime_ = null;
      if (jobStartTimeBuilder_ != null) {
        jobStartTimeBuilder_.dispose();
        jobStartTimeBuilder_ = null;
      }
      onChanged();
      return this;
    }
<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