How to run a function at specific time & date?

Question

How can I run a function at a given time and date?

Example: I have a function that needs to run on the 12th of each month at 10AM.

This page will be running

Answer 1

maybe use and iframe with meta refresh and workout content server side

or use javascripts setInterval

var interval = 300000; // run in 5 minutes
window.setInterval("reloadRefresh();", interval);

function reloadRefresh() {
 // do whatever
}

and