Trying to get date format in Google Sheets to display as 1st, 2nd, 3rd etc with the relevant suffix using google scripts editor

I am trying to get the date format currently displaying as Monday 25 @ 7:30 PM but I would like it to display showing the relevant suffix i.e. 'th' or 'st' or 'nd' i.e. 4th, 1st, 2nd etc.

I am using the code below but getting the error message "Exception: Invalid argument: date. Should be of type: Date" any ideas? Much apprecitated

 function getOrdinal(date) {
    var d = new Date(),
    suffix = ['th', 'st', 'nd', 'rd'][(d > 3 && d < 21) || d % 10 > 3 ? 0 : d % 10];

return Utilities.formatDate(date, Session.getScriptTimeZone(), "d'" + suffix + "MMMM, yyyy");
}

Explanation:

Your goal is to convert the date in the sheet to Monday 25th January 2021.

• You can use your current solution to obtain 25th and then use Utilities.formatDate to obtain day, month and year.

• Template literals were used to concatenate the resulting string.

Code snippet:

Execute myFunction to paste the new format in column M assuming the data input is in column L (see screenshot):

function myFunction(){
 const ss = SpreadsheetApp.getActive();
 const sh = ss.getSheetByName('Sheet1'); // put the name of your sheet
 const dts = sh.getRange('L1:L6').getValues().flat();
 const new_dts = dts.map(c=>[getOrdinal(c)]);
 sh.getRange(1,13,new_dts.length,1).setValues(new_dts);
}


function getOrdinal(input) {
 const dt = new Date(input);
 const d = dt.getDate();
 const suffix = ['th', 'st', 'nd', 'rd'][(d > 3 && d < 21) || d % 10 > 3 ? 0 : d % 10]; 
 const dayN = Utilities.formatDate(dt, Session.getScriptTimeZone(), "EEEE");
 const ds = d+suffix;
 const rd = Utilities.formatDate(dt, Session.getScriptTimeZone(), "MMMM yyyy");
 return `${dayN} ${ds} ${rd}`;
}

Example sheet of code snippet: