Download version 1
Version 1 uses a PHP script to get the current date and time, and accepts PHP date format strings for customizing the output. You may need to navigate to this extension’s files and update the timezone specified in date.php. You can find acceptable timezone identifiers here. If you’re reasonably familiar with PHP, you can also change the default date string.
Usage
> datetime
query optional, default will return full date string. December 7, 2011 11:19:42am
> datetime H:i:s
returns 11:20:18
More information on the PHP date format options
Download version 2
Version 2 is entirely in shell.
Usage
> dt
query optional, default will return full date string. Wed Dec 7 11:21:58 PST 2011
> dt +%T
returns 11:22:19
More info on shell script date formats
Of course, with either of these extensions – or any other – you can change the keyword to something else you’d prefre.
You can download Alfred App for free here: http://www.alfredapp.com/.
To kick things up a notch with extensions and more, get the Powerpack for Alfred.