Google Sheets Timestamp on change - google-apps-script

Question

What I'm trying to achieve is really simple however I'm super uncomfortable with the Google Sheet Script Editor.
I want the date in a certain cell updated whenever something changes on the active sheet.
That's what I got so far:
//Timestamp on change
function timestampOnChange() {
getActiveCell().setValue(new Date());
}
However, even that already returns error messages :/

Answer 1

Explanation:
You need to create an onChange() trigger of a particular
function which will update a specific cell of the active sheet when the spreadsheet
changes content or structure.
The updateCell() function updates the value of B1 with the current
timestamp of the active sheet.
I would advice you to update a specific sheet instead of the active
sheet by using:
const sh = ss.getSheetByName('Sheet1');
instead of:
const sh = ss.getActiveSheet();
Solution:
In more detail, The createOnChangeTrigger() function will create
the onChange() trigger that will execute updateCell() when there
is a change in the content or structure of the spreadsheet file and in our case the active sheet.
function createOnChangeTrigger(){
const ss = SpreadsheetApp.getActive();
ScriptApp.newTrigger("updateCell")
.forSpreadsheet(ss)
.onChange()
.create();
}
function updateCell(){
const ss = SpreadsheetApp.getActive();
const sh = ss.getActiveSheet();
sh.getRange('B1').setValue(new Date());
}
Instructions:
Copy/Paste both functions in the script editor and execute createOnChangeTrigger() only once.
References:
onChange()

Answer 2

From the question:
//Timestamp on change
function timestampOnChange() {
getActiveCell().setValue(new Date());
}
However, even that already returns error messages
The above code returns an error because theres isn't a built-in Google Apps Script function named getActiveCell(). To get the active cell you could use
SpreadsheetApp.getCurrentCell()
or
SpreadsheetApp.getActiveRange()
or if you use an edit event object (let say that it's a assigned to e) you could use e.range
It's worthy to not that if you use setValue(new Date()) on the active cell what ever that was entered on that cell will be overwritten.
On Web Applications, a sister site of Stack Overflow, there a lot of Q/A about timestamps in Google Sheets, actually, there is tag for them ---> https://webapps.stackexchange.com/questions/tagged/google-sheets-timestamp. So far there are 102 questions with this tag.