I have created a user-script and added a post for it on stackapps Replace all relative times with local times
For info on how to install user-scripts in different browsers, check the info of the script tag in stackapps .
The script will replace the relative dates with your local date after hovering over a date. I made it like that, because sometimes the relative date is more useful. Specially when it's x minutes ago or x hours ago.
If you know what you are doing already and don't need any of the above info:
To view the source of the script: https://gist.github.com/dannyhajj/8057530
To install the script click here.