1.5.1 (101) Announcement event is about to begin

hello .
I would like to add an event notification system id of time
Example : 21h appeared event and I want to have a message ( red ) to let people know . I added apolici.data how it performs ?
Automatic notification system

don't touch aipolicy for this.
Use php script with crontab.

Can you guide me or give me 1 link guides available
Thank you

https://en.wikipedia.org/wiki/Cron
in ur case

Код:

0 21 * * * php /path/to/script.php

Automatic notification system to be run Crontab . But I do not know why it does not automatically run every 5 minutes . Can you tell me where? Although comprehensive . Thank you

*/5 * * * * sh /etc/script.sh