Regional time and date on apps script to google sheet not converting to local time

Question

I’m based in Australia and tried out the awesome ESP 8266 code by Sujay Phadke (electronicsguy) https://github.com/electronicsguy/ESP8266 - great code and project but I cannot get the date and time to sync with Australian time – it seems to be GMT. I’ve tried a few variations on lines 36 and 37 var date_now = Utilities.formatDate(new Date(), "CST", "yyyy/MM/dd"); // gets the current date var time_now = Utilities.formatDate(new Date(), "CST", "hh:mm:ss a"); // gets the current time and have set the regional time on both the Ap script ans spreadsheet to local (Australian) time – but nothing I do seems to make it work. Any ideas? Apps script is as follows:

// Example Google Scrips code to upload data to Google Sheets from Arduino/ESP8266
// Follow setup instructions found here:
// https://github.com/StorageB/Google-Sheets-Logging
// contact: [email protected]
//
// This example uses the HTTPSRedirect library by Sujay Phadke
// https://github.com/electronicsguy/ESP8266


// Enter Spreadsheet ID here
var SS = SpreadsheetApp.openById('3213k-okfjdk-gkeJHjd87-vdKei-lKQDIc-a2a_Hjg4');
var str = "";


function doPost(e) {

  var parsedData;
  var result = {};
  
  try { 
    parsedData = JSON.parse(e.postData.contents);
  } 
  catch(f){
    return ContentService.createTextOutput("Error in parsing request body: " + f.message);
  }
   
  if (parsedData !== undefined){
    var flag = parsedData.format;
    if (flag === undefined){
      flag = 0;
    }
    
    var sheet = SS.getSheetByName(parsedData.sheet_name); // sheet name to publish data to is specified in Arduino code
    var dataArr = parsedData.values.split(","); // creates an array of the values to publish 
         
    var date_now = Utilities.formatDate(new Date(), "CST", "yyyy/MM/dd"); // gets the current date
    var time_now = Utilities.formatDate(new Date(), "CST", "hh:mm:ss a"); // gets the current time
    
    var value0 = dataArr [0]; // value0 from Arduino code
    var value1 = dataArr [1]; // value1 from Arduino code
    var value2 = dataArr [2]; // value2 from Arduino code
    
    
    // read and execute command from the "payload_base" string specified in Arduino code
    switch (parsedData.command) {
      
      case "insert_row":
         
         sheet.insertRows(2); // insert full row directly below header text
         
         //var range = sheet.getRange("A2:D2");              // use this to insert cells just above the existing data instead of inserting an entire row
         //range.insertCells(SpreadsheetApp.Dimension.ROWS); // use this to insert cells just above the existing data instead of inserting an entire row
         
         sheet.getRange('A2').setValue(date_now); // publish current date to cell A2
         sheet.getRange('B2').setValue(time_now); // publish current time to cell B2
         sheet.getRange('C2').setValue(value0);   // publish value0 from Arduino code to cell C2
         sheet.getRange('D2').setValue(value1);   // publish value1 from Arduino code to cell D2
         sheet.getRange('E2').setValue(value2);   // publish value2 from Arduino code to cell E2
         
         str = "Success"; // string to return back to Arduino serial console
         SpreadsheetApp.flush();
         break;
         
      case "append_row":
         
         var publish_array = new Array(); // create a new array
         
         publish_array [0] = date_now; // add current date to position 0 in publish_array
         publish_array [1] = time_now; // add current time to position 1 in publish_array
         publish_array [2] = value0;   // add value0 from Arduino code to position 2 in publish_array
         publish_array [3] = value1;   // add value1 from Arduino code to position 3 in publish_array
         publish_array [4] = value2;   // add value2 from Arduino code to position 4 in publish_array
         
         sheet.appendRow(publish_array); // publish data in publish_array after the last row of data in the sheet
         
         str = "Success"; // string to return back to Arduino serial console
         SpreadsheetApp.flush();
         break;     
 
    }
    
    return ContentService.createTextOutput(str);
  } // endif (parsedData !== undefined)
  
  else{
    return ContentService.createTextOutput("Error! Request body empty or in incorrect format.");
  }
}