What are some alternatives?
When comparing World Time Buddy and Channel Time, you can also consider the following products
Time.is - exact time in any location
Spacetime - Work hour and time zone management for distributed teams.
Chronozone - The easy way to check times throughout the world.
Every Time Zone - Online tool for keeping up with times around the world.
timeanddate.com - Free Clock for your website or blog!
Timezone.io - Keep track where and when your team is.