hmm. I don't thing that there is an exact time of when Segwit will be activated. Thus, there should not be a way to make a countdown for it.
But, you could have a JS app which looks at how many % of miners/nodes are signalling SegWit.
Thats what i kind of want to do(a JS script(app) that shows the % of miners/ that are signaling Segwit for These cryptocurrencies. do you know how to do a JS code for signaling % of miner/nodes that are signaling segwit? if so could you please send me the JS code for it via PM?