public Builder setValidAfterTime(com.google.protobuf.Timestamp.Builder builderForValue) {
        if (validAfterTimeBuilder_ == null) {
          startTimingConstraints_ = builderForValue.build();
          onChanged();
        } else {
          validAfterTimeBuilder_.setMessage(builderForValue.build());
        }
        startTimingConstraintsCase_ = 4;
        return this;
      }
<pre>
An absolute time at which resources may be created.
</pre>

<code>.google.protobuf.Timestamp valid_after_time = 4;</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/QueuedResource.java