There are four possible reasons for this:
1) Your system clock is wrong,
2) Your system time zone setting is wrong,
3) You are running the clock in 24-Hour Analog Clock mode.

Check your system settings. Set the 24-Hour Analog Clock checkbox - restart the Widget - clear the 24-Hour Analog Clock checkbox - restart the Widget.

4) Your daylight saving rules have been changed after March 2007 when the Widget was last updated. The problem could then be that your operating system has not been updated or that WCP has out of date rules. Without knowing your location, it is impossible to say which.

Clock can only be used ONCE. There's NO WAY to "make" another clock .... say you want to view times in different locations - AT THE SAME TIME (like the picture above shows).
Only worth it if you don't mind *having to switch* from place to place.

Changing time/city is done via the Widget's preferences (Right-Click for context menu, then select Widget Preferences). The + sign is used to spawn another clock - it looks like that's not working on your system. There are various reasons for it not working, but you would have to supply a lot more information about your system for me to make any progress with that.

WHAT A WIDGET,THE MOST STYLISH WIDGET I HAV EVER SEEN AND USED.THANKS TO WHOMSOEVER MADE IT

I now have my hometown's time on the desktop, too.