To Use This Extension

Follow this guide to install raw chrome extensions: https://developer.chrome.com/docs/extensions/get-started/tutorial/hello-world#load-unpacked

In short:

1. Download this repo to a folder locally.
2. Go to chrome://extensions/
3. Toggle on the Developer mode on the top right if you haven't.
4. Click "Load unpacked" button.
5. Select the downloaded folder. Click open.

Github community discussion: https://github.com/orgs/community/discussions/58663

Result

Displayed in 24-hour format.
Under / After the relative time.
Your brower's local timezone.

An Alternative Approach

Add this bookmark
Name: Convert
URL: javascript:(function() %7B var style %3D document.createElement(%27style%27)%3B document.head.appendChild(style)%3B var sheet %3D style.sheet%3B sheet.addRule(%27time-ago:before,relative-time:before%27, %27content: attr(title)%3Bdisplay: block%3Bfont-size: 0.5rem%3B%27)%3B %7D)()

Click it to convert relative time to absolute time.