MediaWiki:Common.js

// Any JavaScript here will be loaded for all users on every page load.

// Get current date info
var today = new Date();
var month = today.getMonth() + 1; // JS months are 0-based so add 1
var day = today.getDate();

// Define the day and month you want to trigger April Fools mode
var prankMonth = 4;
var prankDay = 1;

// Check if it's prank day
if (month === prankMonth && day === prankDay) {
    // Get the current page name
    var pageName = mw.config.get('wgPageName');
    
    // If we're not already on an AF page, redirect to it
    if (!pageName.startsWith('AF:')) {
        window.location.href = '/wiki/AF:' + pageName;
    }
}