What are some alternatives?
When comparing Time&Time and Spacetime, you can also consider the following products
Every Time Zone - Online tool for keeping up with times around the world.
Timezone.io - Keep track where and when your team is.
Channel Time - Automatic time zone conversions for your team
TimeZoneNinja - Scheduling meetings around the world just got easy
There - Never think of timezones again!
World Time Buddy - Effortless time conversion and world time.