The Digital Clock displays the current date and time both for the local user plus any number of additional time zones. We can drag it any place in our web page ,it is help full to find out your client location timings with your local time ,you can change the display time colors and you can change client location timing short format or long format,it is light weight web part,you should enter respect client timings with correct format.
Is the Flash source included in the source code package?
Is this accept any kind of format?
No, you have to menstion like this format ,Ex:Adiloide/9.30,
Can the additional time zones be set per user? we want each user to be able to choose the time zones he is interested in?
Your authenticated users can actually access the web part settings via the web part’s "digital clock properties” menu entry and personalize the settings.