public Builder clearValidUntilTime() {
        if (validUntilTimeBuilder_ == null) {
          if (startTimingConstraintsCase_ == 2) {
            startTimingConstraintsCase_ = 0;
            startTimingConstraints_ = null;
            onChanged();
          }
        } else {
          if (startTimingConstraintsCase_ == 2) {
            startTimingConstraintsCase_ = 0;
            startTimingConstraints_ = null;
          }
          validUntilTimeBuilder_.clear();
        }
        return this;
      }
<pre>
An absolute time after which resources should not be created.
If the request cannot be fulfilled by this time the request will be
failed.
</pre>

<code>.google.protobuf.Timestamp valid_until_time = 2;</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/QueuedResource.java