How does a script run at a certain time?

Question

linux

Hello, I would like to ask a question, to make this script
"At a certain time, it launches a script that creates a folder. The user must enter the start time and the name of the folder manually"
The problem is that I do not know the sequence of actions after I enter crontab, an editing window pops up , and how to enter data there using a script?

Answer 1

man at
https://linux-faq.ru/page/komanda-at