Creating a circular countdown timer

[eco_bach]

I’m a C# -Unity novice and need some tips in creating a countdown timer.
Basically a value that decrements surrounded by a circular progress bar.

http://www.countdownkings.com/wp-content/uploads/countdown_timer_nano_2.gif

or
http://cdn.tripwiremagazine.com/wp-content/uploads/2012/09/jbmarket-circular-countdown.jpg

Coming from an AS3 background this would be trivial for me to create in Flash, a simple class with getters-setters and probably graphical asset consisting of a mask that rotates.
But not sure how to approach creating this in Unity.

[robertbu]

If you Google ‘unity3d circular progress bar’, you will find lots of hits, including sample packages, blogs, and more. The most common UA reference is:

http://answers.unity3d.com/questions/14770/creating-a-circular-progressbar-timer.html

…and this came up as the first hit:

http://www.theappguruz.com/sample-code/circular-progress-bar/