I've been told by my clients that scheduled jobs are not run some times as expected. I never questioned myself about how wp_cron actually works, I thought it was kinda self-explanatory. But now I doubt it.
Codex says that timestamp argument is:
the first time that you want the event to occur. This must be in a UNIX timestamp format.
I know that wp_cron triggers events when someone visits the site. But what if the visit happens little bit after the time hardcoded in timestamp? Will that event still trigger? Or pass?