This is kinda neat. However, I found the time zone suggestions nearly useless past the initial one. I live in Chicago, and that was a suggestion initially, so great.

...But then all of the suggestions for cities to add were "close" timezones. I naturally can quickly infer when California or New York time is, so once I've selected that I'm in Chicago, a pile of suggestions for n-2 and n+2 cities isn't all that helpful.

If I pick a US-based initial timezone, offer me London, Tokyo, etc. Like, suggest timezones that I probably can't easily calculate from memory, and am likely to be interested in based on popularity in international business.