Greasy Fork

Unclear how to use this or make it work. Can you provide a screenshot or gif showing how to activate this and set the two different timezones it will show me?? (the script is enabled, but how do I actually use it?)

There appears to be a slight change in time formatting by whatsapp.

You have to add toLowerCase() to the if condition check in Line 51

The function will be

function updateTimestamps() {
  document.querySelectorAll("span").forEach((span) => {
    if ([" am", " pm"].includes(span.innerHTML.slice(-3))) {
      span.innerHTML = convertESTtoIST(span.textContent);
    }
  });
}