A script which adds a button to Goodreads for setting the Read date to the shevled date.

goodreads-setreaddates.js

// ==UserScript==
// @name        Goodreads Set ReadDate
// @namespace   Violentmonkey Scripts
// @match       https://www.goodreads.com/review/list/*
// @grant       none
// @version     1.0
// @author      -
// @description 20/12/2021, 12:05:54 pm
// ==/UserScript==

const shelfName = 'read';
const reviewIdRegex = /reviewEditor.summon\(this, (\d+),.*reading_session_id: "(.*?)"/

const csrfToken = document.querySelector('#reviewEditForm input[name="authenticity_token"]').value;

const setReadDate = async (reviewId, sessionId, date) => {
  const response = await fetch(`https://www.goodreads.com/review/update/${reviewId}`, {
    method: 'POST',
    credentals: 'include',
    headers: {
      'X-CSRF-Token': csrfToken
    },
    body: new URLSearchParams({
    '_reading_session_id':sessionId,
    'review[read_at(1i)]':date.getFullYear(),
    'review[read_at(2i)]':date.getMonth() +1,
    'review[read_at(3i)]': date.getDate(),
    'view':'table',
    'shelf':'read',
    'format':'json'
    })
  });
}

const getReviewId = (dateReadColumn) => {
    const editLink = dateReadColumn.querySelector('a.floatingBoxLink.smallText');
    const editClick = editLink.getAttribute('onclick');
    const match = reviewIdRegex.exec(editClick);
    if (!match) {
      console.log(`Failed to extract reviewId from ${editClick}`);
      return;
    }
    return {
      reviewId: match[1],
      sessionId: match[2],
    };
}

const updateDateText = (dateReadEl, date) => {
  const greyText =dateReadEl.querySelector('.greyText');
  greyText?.remove();
  
  let dateText = dateReadEl.querySelector('.date_read_value');
  if (!dateText) {
    dateText = document.createElement('span');
    dateText.setAttribute('class', 'date_read_value');
    dateReadEl.prepend(dateText);
  }
  
  dateText.innerText = date.toLocaleString('en-us',{month:'short', day: 'numeric', year:'numeric'});
}

const makeLinkButton = (dateReadEl, { reviewId, sessionId }, date) => {
  const link = document.createElement('a');
  link.href = '#';
  link.setAttribute('class', 'floatingBoxLink smallText');
  link.innerText = `[use shelved]`;
  
  link.addEventListener('click', async e => {
    e.preventDefault();
    console.log(`Setting read date for ${reviewId} to ${date}`);
    await setReadDate(reviewId, sessionId, date);
    console.log('Done!');
    updateDateText(dateReadEl, date);
  });
  return link;
}

setTimeout(() => {
  const books = document.querySelectorAll('.bookalike.review');
  for (const book of books) {
    const dateRead = book.querySelector('.field.date_read .editable_date');
    const reviewId = getReviewId(dateRead);
    if (!reviewId) continue;
    
    const dateAdded = book.querySelector('.field.date_added')?.innerText;
    if (!dateAdded) continue;
    const date = new Date(dateAdded);

    const setDateButton = makeLinkButton(dateRead, reviewId, date);
    dateRead.appendChild(setDateButton);
  }
}, 1000);