public Builder setModificationDate(long value) {
            copyOnWrite();
            instance.setModificationDate(value);
            return this;
        }
<code>optional int64 modification_date = 3;</code>

@param value The modificationDate to set.
@return This builder for chaining.
turms-client-kotlin/src/main/java/im/turms/client/model/proto/model/message/Message.java