Execute at a certain time

[Anon]

How would I get a script to execute at a certain time... for example, to send out a newsletter every day at midnight?
Is there any specific functions?

[Anon]

That's not a functionality that you would expect a Web scripting language to provide. Or, for that matter, any scripting language.

But any reasonable operating system should include a task scheduler. Under Unix, it's cron. I am not familiar with the equivalent NT tool.

To run a PHP script with cron, use either the standalone (CGI) version of PHP, or call a URL with a tool such as wget or lynx.

[Anon]

Going on about this : is it possible to have the script wait for some time and then try again to run if it was not possible the first time? (my script, called by a cron job, might not be able to run because a user is inputting something at that moment)