Compare date with present date in google sheets script - google-apps-script

Question

I want to compare the dates in Referral Date column with the present day and if Referral Date is lesser than present day then proceed with script if not throw an error "future date referral".
function dateFun() {
var ss = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Worksheet");
var headers = ss.getRange('A:Z').getValues()[0];
var column =headers.indexOf("Referral Date")+1;
var presentDay = new Date();
if (column.valueOf()>presentDay){
}else{
SpreadsheetApp.getUi().alert("Future Date Referral")
}
}
Image for reference
Hope its clear!

Answer 1

Date objects can be compared with logical operators.
Ok you are on the right track here, but you are missing some important methods to get the data from the spreadsheet.
function dateFun() {
// Open the worksheet
var ss = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Worksheet");
// Get data display values
var range = ss.getRange('A:Z');
// Get index of "Referral Date" in headers
var headers = range.getValues()[0];
var columnIndex = headers.indexOf("Referral Date")+1;
// Get today's date
var presentDay = new Date();
// Loop through the dates column
for(var i=1;i<=range.getNumRows();i++){
// Get the value to compare to today
var rowDate = new Date(range.getValues()[i+1][columnIndex]);
if(rowDate.valueOf()>presentDay.valueOf()){
SpreadsheetApp.getUi().alert("Future Date Referral");
}
}
}
Further reading:
Date()
getDisplayValue()