TypeError：无法调用方法＆＃34; getDay＆＃34;未定义的

Question

我跳进一个已经工作了一年多的脚本 - 现在已经开始发布TypeError：无法调用方法＆＃34; getDay＆＃34;未定义的。

我认为这是导致问题的功能 - 但不确定如何解决：

function businessDaysBetween(startDate, endDate) {
  var dayDiff = endDate.getDay() - startDate.getDay();

  if (dayDiff < 0) {
    dayDiff = 5 + dayDiff;
  }

  return Math.floor((((endDate.getTime() - startDate.getTime())/1000/60/60/24/7) * 5) + dayDiff);
}

---

function sendReminderEmail() {
  try {
    //Open Google spreadsheet "New Hire - Notification", and retrieve "New Hire" sheet
    var spreadsheet = SpreadsheetApp.openById("is identified");
    var sheet = spreadsheet.getSheetByName("New Hire");
  }
  catch (e)
  {
    Browser.msgBox(e.message);
  }
  var rows = sheet.getLastRow();
  var currentDate = new Date(); 

  //Iterate through rows
  for (var i = 2; i <= rows; i++) {
    var hrngMgrComplete = sheet.getRange(i, sheet.getLastColumn());
    //Check if hiring manager has completed details form
    if (hrngMgrComplete.getValue() != "Yes") {
      var reminderDate = sheet.getRange(i, 13).getValue();
      var days = businessDaysBetween(reminderDate, currentDate);
      //check if last reminder was sent earlier than 3 business days or more 
      //from today.
      if (days >= 3) {
        var noOfReminders = sheet.getRange(i, 14).getValue();
        //Send appropriate email based on how many reminders have been received
        if (noOfReminders == 0) {
          sendFirstReminder(i);
        }
        else if (noOfReminders == 1) {
          sendSecondReminder(i);
        }
        else if (noOfReminders == 2) {
          sendHRNotification(i);
        }
      }
    }  
  }
}

---

可能是 var currentDate = new Date（）;