提醒日期的电子邮件提醒栏

Question

我有一个脚本，用于根据一栏中提到的特定日期自动发送电子邮件提醒。我的目的是在提醒日期起7天前发送提醒。该脚本可以完美运行并在我运行时发送电子邮件，但在提醒日期的第7天不能自动运行。

请帮助纠正它

var EMAIL_SENT = "EMAIL_SENT";

function sendEmails3() {
var today = new Date().toLocaleDateString();  // Today's date, without 
time

var sheet = SpreadsheetApp.getActiveSheet();
var startRow = 3;  // First row of data to process
var numRows = sheet.getLastRow()-1 // Get last row, -1 because your 
startrow is 3
// Fetch the range of cells A3:B999
var dataRange = sheet.getRange(startRow, 1, numRows, 999)
// Fetch values for each row in the Range.
var data = dataRange.getValues();
for (var i = 0; i < data.length; ++i) {
var row = data[i];
var emailAddressTo = row[8];  // POC Email column D
var emailAddressCC = row[9];
var subject = " Case PEC V/s " +row[2];     // Subject column F
var message = "Dear Sir, Please ensure to attend the hearing in the 
captioned matter and update the status of hearing. Kindly contact with the 
advocate for the courtroom and item number. Hearing date is  " +row[6] +" 
. Case no is: " +row[3] + " . Advocate M/s " +row[4];   // Message column 
G and Column H
var emailSent = row[13];   // Output the message is sent in column H
var cellValue,reminderDate;//Define variables at top of function

cellValue = row[10];// date specified in cell k

if (!cellValue) {continue;}//If there is no cell value continue looping

if (typeof cellValue === 'object') {
reminderDate = cellValue.toLocaleDateString();
} else {
cellValue = new Date(cellValue);//Convert date as string to object
reminderDate = cellValue.toLocaleDateString();
}
if (reminderDate != today)      // Skip this reminder if not for today
  continue;

if (emailSent != EMAIL_SENT) {  // Prevents sending duplicates

  MailApp.sendEmail(emailAddressTo, subject, message);
  MailApp.sendEmail(emailAddressCC, subject, message);
  sheet.getRange(startRow + i, 15).setValue(EMAIL_SENT);
  // Make sure the cell is updated right away in case the script is 
  interrupted
  SpreadsheetApp.flush();
   }
 }
}