Run a script every day at a set time with Apps Script

Originally written for bulldo.gs — republished here with the canonical link pointing home.

I want to schedule a Google Apps Script function to run automatically at a specific time every day without having to trigger it manually.

// Run myDailyJob at 8 AM every day (script timezone).

// Call createDailyTrigger() once from the editor — never from a trigger.

function createDailyTrigger() {