public Builder mergeExpireTime(com.google.protobuf.Timestamp value) {
      if (expireTimeBuilder_ == null) {
        if (expirationCase_ == 13
            && expiration_ != com.google.protobuf.Timestamp.getDefaultInstance()) {
          expiration_ =
              com.google.protobuf.Timestamp.newBuilder((com.google.protobuf.Timestamp) expiration_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          expiration_ = value;
        }
        onChanged();
      } else {
        if (expirationCase_ == 13) {
          expireTimeBuilder_.mergeFrom(value);
        } else {
          expireTimeBuilder_.setMessage(value);
        }
      }
      expirationCase_ = 13;
      return this;
    }
<pre>
Non-empty default. The timestamp in UTC when the subscription expires.
Always displayed on output, regardless of what was used on input.
</pre>

<code>
.google.protobuf.Timestamp expire_time = 13 [(.google.api.field_behavior) = NON_EMPTY_DEFAULT];
</code>
java-workspaceevents/proto-google-cloud-workspaceevents-v1/src/main/java/com/google/apps/events/subscriptions/v1/Subscription.java