I am able to add a timestamp in column 5 using a conditional when I'm comparing the column to a number, but what I am actually trying to do is add a stamp to the corresponding cell in column 5 if a cell in column 1 is checked as TRUE. When the box is checked, the corresponding cell in column 5 never displays the timestamp:

function onEdit(e) {
  var attendanceSheet = e.source.getActiveSheet();
  var row = e.range.getRow();
  var col = e.range.getColumn();

  if(col === true){
    attendanceSheet.getRange(row,5).setValue(new Date());    


enter image description here



if(col === true){


if (e.value === 'TRUE') {

To get a truly blank value instead of a zero-length text string, replace




This makes a difference with functions like count() and isblank().

  • Thank you. I have a follow-up question. How can I use isBlank() method in combination with e.value to detect if a cell is actually blank/empty or not. If I need to officially ask this question by posting it, let me know, and I will. Jul 28 at 17:59
  • Please post a new question, and make sure that you describe the problem rather than discussing e.valueet al. Be clear what you mean by "cell is actually blank/empty", i.e., do you want the behavior that matches that of isblank(A1) or the behavior that matches that of not(not(len(A1))). Jul 28 at 19:54
  • OK, thanks. I will rephrase and post the question. Jul 29 at 17:38

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