Publish Date use crontab?

we have shared hosting have not access to crontab can't add cronjob

Publish Date can provide a date to automatically trigger publication this option work with crontab?

how to use another method??
CRAV not published page by Publish Date

I know it's not always possible, but you should always try to choose hosting that gives you proper control. Move to a proper host if you can.

To answer your question specifically, I can see this in the Grav docs:

The underlying processing relies on the server's cron scheduler

I've never tried using this new scheduler, but looks like it needs cron.