public Builder mergeTimeZone(com.google.type.TimeZone value) {
      if (timeZoneBuilder_ == null) {
        if (timeOffsetCase_ == 3 && timeOffset_ != com.google.type.TimeZone.getDefaultInstance()) {
          timeOffset_ =
              com.google.type.TimeZone.newBuilder((com.google.type.TimeZone) timeOffset_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          timeOffset_ = value;
        }
        onChanged();
      } else {
        if (timeOffsetCase_ == 3) {
          timeZoneBuilder_.mergeFrom(value);
        } else {
          timeZoneBuilder_.setMessage(value);
        }
      }
      timeOffsetCase_ = 3;
      return this;
    }
<pre>
Time zone e.g. "America/Los_Angeles".
</pre>

<code>.google.type.TimeZone time_zone = 3;</code>
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/TimecodeConfig.java