I assigned the "center view on now time" command to the period key some months ago. Soon after that I decided to use a different key for the command so I removed it from the period key, but, strangely, when I hit the period key it still works as "center view on now time."
The only way to fix it is using [Zap All] (I tried assigning a new command to the period key, and the "Do Nothing" command, too). But I don't want to re-bind everything I've bound to date, so I contacted support. And it's been about 2 months since then with no reply....
So I don't recommend binding the "center view on now time" command.
Anyway, you have to hold down the key to make it work so it's not really usable...