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That's the whole point of the site. If I'm trying to figure out what time it is for my co-worker in Canberra Australia, I don't want to have to Google what time zone they are in (Australian Eastern Daylight Time). Just put the city in and it does the math for you.

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I mean, other sites[0] that I've used seem to have a list of major cities (not Google Maps autocomplete)

[0] https://www.worldtimebuddy.com/

I'm talking about the official "tz" database, which contains a large list of cities and geographic coordinates. So if you want to autodetect, you just need approximate lon/lat and then grab the closest tz city.

https://en.wikipedia.org/wiki/List_of_tz_database_time_zones

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