Although there are many who use Joomla who are not from/in the USA . . . but for those of you who are – if you’d like to change the date format in Joomla to the American format – this one’s for you.
STEP ONE:
Navigate to the en-GB.ini file, which is in this location: your root directory/languages/en-GB/en-GB.ini
STEP TWO:
Open the en-GB.ini file with your plain text editor and look for this line of code towards the top of the file:
DATE_FORMAT_LC2=%A, %d %B %Y %H:%M
That’s Linux date format code, and you’ll need to change it to this: DATE_FORMAT_LC2=%B %d, %Y
STEP THREE:
Once you make that change, save the en-GB.ini file
Go back to the front of your site and refresh the page.
Now, here’s an important note to keep in mind: when you make this change, you’re editing a core Joomla file. When you upgrade Joomla, there’s a chance that there will be a new language directory, a new en-GB directory, or a new en-GB.ini file.
If that’s the case, when you upgrade, your date change will be lost, since the en-GB.ini file that you edited will be overwritten by the new one in the Joomla upgrade package.