public Builder clearTime() {
        bitField0_ = (bitField0_ & ~0x00000001);
        time_ = null;
        if (timeBuilder_ != null) {
          timeBuilder_.dispose();
          timeBuilder_ = null;
        }
        onChanged();
        return this;
      }
<pre>
The timestamp indicating the time the event occurred.
</pre>

<code>.google.protobuf.Timestamp time = 1;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java