newb: CountDown Clock
I have an app that is for online test taking. Most online test are 30 mins to 2hrs. I need to create count down clock from the when the test is stared. If 30 mins test, then count down will start from 30 mins : 00 Secs - 29 min: 59 secs and so on. How do I do this?
Here are quite a few options to choose from: