Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
Time Buddy - Time Buddy brings a colorful world clock.
BusyCal - powerful calendar app for macOS
Time Zone Converter - Time Zone Converter is an online productivity tool to calculate exact time across time zones.
Google Calendar - Spend less time managing your day & more time enjoying it
World Clock - World Clock is an app that lets you see the time of any city in the world.