24 Time Zones is described as 'More Than Just a Clock. Check current local time in the world, timezones, time change dates, summer time, daylight saving time, online clock for your website'. There are more than 10 alternatives to 24 Time Zones, not only websites but also apps for a variety of platforms, including iPhone, iPad, Android Tablet and Android. The best alternative is timeanddate.com, which is free. Other great sites and apps similar to 24 Time Zones are World Time Buddy (Freemium), Time.is (Freemium), timee.io (Free) and Every Time Zone (Free).
timehubzone.com are packed full of useful tools and information including International Call Planner, Interactive Time tool, Daylight Saving Time , Sun Clock, World Clock, a section dedicated to World Time News and additional facts related to world time.