How can I have a key pressed at a specific time?

I want to press a certain key (e.g. 'p') in a certain time (e.g. at 00:00), how can I accomplish this? I'm aware of https://apple.stackexchange.com/questions/63897/can-a-mac-be-programmed-to-simulate-pressing-a-key-at-a-certain-rate-via-softwar but this doesn't include a timer of any kind. P.S. I'm running at macOS 10.13 High Seirra