Can somebody pls create a simple time zone planner? it's so exhausting calculating time differences all the time; just something easy – 2 cities and 2 times

I use worldtimebuddy.com/ on web but it's not great on mobile

World Clock & Time Converter

Effortless time conversion and world time. Schedule conference calls, webinars & online meetings, plan travel and track flight arrival time across time zones.

worldtimebuddy.com