DleJSupportHours

Features:

Live online/offline status indicator based on your configured hours
Displays visitor's local time alongside your office time
Automatic timezone conversion - works for visitors anywhere in the world
"Send Message" link appears only when you're offline, guiding visitors to leave a message
Fully configurable: set your timezone, days open, opening/closing times, and contact link
Clean, responsive design that adapts to any template
Zero external dependencies - pure vanilla JavaScript
No AJAX calls or server load - all calculations happen in the browser
Perfect for:

Support desks and help centers
Small businesses with set hours
Freelancers and consultants
Anyone who wants visitors to know when they're available
Simple setup: Just configure your timezone, hours, and contact form link. The module handles the rest automatically.

Lightweight by design. Does exactly what you need, nothing more.