How to generate an uuid in google sheet?

Question

How to generate an uuid in google sheet (for exemple ccb8a660-91c9-a556-58e0-4fa7-229516872004).

Either with a macro? or a formula?

Answer 1

the created uuid is changed with the time.

I think this problem could not be solved without using the Apps Script.
For example:

var sheet = SpreadsheetApp.getActiveSheet();
var values = sheet.getRange('A1:A10').getValues();

for (var i = 0; i < values.length; i++) {
  // When a cell is empty, set a uuid to the cell.
  if (!values[i][0]) {
    sheet.getRange('A' + (1 + i)).setValue(Utilities.getUuid());
  }
}