public Builder clearReadDate() {
            bitField0_ &= ~0x00000004;
            readDate_ = 0L;
            onChanged();
            return this;
        }
<pre>
Update
</pre>

<code>int64 read_date = 3;</code>

@return This builder for chaining.
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/request/conversation/UpdateConversationRequest.java