How can I compare datetimes?

I want to generate pdfs from my database, from tickets. This pdfs are
meant to be generated and saved every Friday at an specific hour. How
can I do that?

John S. wrote:

I want to generate pdfs from my database, from tickets. This pdfs are
meant to be generated and saved every Friday at an specific hour. How
can I do that?

Create a cron job to do that?

I suppose with every rails request you could add something like
if Time.now > last_time_updated
or something

look into the Ruby Date class and Time class.