Quite by accident, I found this widget at the National Institute of Standards and Technology (NIST) website, time.gov. I was looking for the NIST time applet, but siince I have Java® disabled, I was unable to view the time. Then, I noticed a link on that page to their Flash® NIST Widget.
Once I clicked on the link to the widget, I saw another link to a page that published details about embedding the widget on your own website. That page had the HTML embed code along with details on how to customize the widget for your own preferences of how to display the time, background color and time zone. I set this one to ?setcolor=#EAEDF2&setzone=-07&set24=true which represent the parameters for our light blue background color, the UTC minus seven timezone (Arizona) and to display the time in 24 hour format.
Since I already have my own Flash® time and date widget in the sidebar on the main page, I doubt that I will be embedding this one. Note that my widget is driven by the time YOUR computer is set to and the NIST widget gets the time from the NIST Time and Frequency Division (with a minor network delay).