This script is a modification of Kip's "Display absolute timestamps (in local time)"; I have his permission to post this. Most of the credit for the script goes to him.
This script displays timestamps based on your timezone in 12-hour format. This is pretty convenient for anyone who doesn't want to convert UTC to their timezone. Requires Tampermonkey or Greasemonkey.
Please ask Kip and myself if you want to modify this for anything other than personal use.