Board Thread:Support Requests - Getting Technical/@comment-28639118-20160209070711

Can you tell me what's the code to create a countdown timer that counts from 15 seconds to 0 seconds whatever the timer finishes loading and automatically switch page when it hits 0? I know about the span class="countdowndate" thingy, but that's not what I'm talking here, because it's not my kind of countdown. (Note: Please tell me if this is in the wrong board) 