Hi @Marwin Martina,

What you want to do is possible but it requires some advanced Zapier setup. 

To change a specific value in Monday.com you need to know the “board_id”, “item_id”, and “column_id” which can only be found using a Zapier code step.

The basics are:

1. Trigger off of Acuity Reschedule
2. Use a code step to search for the item_id and column_id
   1. You will need a term you can use for the search that is unique.  Something like email works well
3. “Update Item Date Column Value” which takes the item_id and column_id form step 2 to insert the new date and time

Here is the basic code.  You will need to put in your own API_Key and boardId values and make sure you use an “email” column to store the persons email.

const API_KEY = "xxxxxxxx",
      boardId = 0000000;

const sendRequest = async (payload) => {
  const response = await fetch("https://api.monday.com/v2/", {
    method: "POST",
    body: JSON.stringify(payload),
    headers: {
      "content-type": "application/json",
      authorization: API_KEY,
    },
  });

  const results = await response.json();

  return results;
};

const getItem = async () => {
  const query = `
      query {
        items_by_column_values (board_id: ${boardId}, column_id: "email", column_value: "${inputData.email}") {
          id
          name
        }
      }`;

  const response = await sendRequest({
    query,
  });

  const results = response.datat'items_by_column_values']'0].id;

  return results;
};


const response = await getItem();


output = {
   id: response
};

Thank you