get-message-by-timestamp.js

const params = new sb.MessageListParams();
params.prevResultSize = PREV_RESULT_SIZE;
params.nextResultSize = NEXT_RESULT_SIZE;
params.isInclusive = INCLUSIVE;
params.reverse = REVERSE;
params.includeReplies = INCLUDE_REPLIES;
params.includeThreadInfo = INCLUDE_THREAD_INFO;
params.includeParentMessageText = INCLUDE_PARENT_MESSAGE_TEXT;
...
groupChannel.getMessagesByTimestamp(TIMESTAMP, params, (messages, error) => {
    if (error) {
        // Handle error.
    }
    // A list of previous and next messages on both sides of a specified timestamp is successfully retrieved.
    messages.forEach(message => {
        ...
    });

    ...
});