How to use clearTimerbyHandler and GetTimerElapsedByHandle

Newbie to UE4. I am following the video here:

At time 21:14 and couple seconds later, there are two use of Clear Timer by Function which are not available anymore. Same at 22:28 there is a GetTimer which is not available too.
Anybody can help how to make them work with clearTimerbyHandler and GetTimerElapsedByHandle?

Thanks in advance!