GoogleSheets TimeStampOnEdit (js)

TimeStampOnEdit.js

function onEdit() {
var s = SpreadsheetApp.getActiveSheet();
if( s.getName() == "Sheet1" ) { //checks that we're on Sheet1 or not
var r = s.getActiveCell();
if( r.getColumn() == 1 ) { //checks that the cell being edited is in column A
var nextCell = r.offset(0, 1);
if( nextCell.getValue() === '' ) //checks if the adjacent cell is empty or not?
nextCell.setValue(new Date()).setNumberFormat("yyyy-MM-dd" );
var nextNextCell = r.offset(0, 2);
if( nextNextCell.getValue() === '' ) //checks if the adjacent cell is empty or not?
nextNextCell.setValue(new Date()).setNumberFormat("hh:mm AM/PM" );
}
}
}