In C++ on Windows, given a city, lets say london or newyork or sydney or singapore etc.. how do I find the UTC offset for each of them, ie the function should be able to accept a city name and return the UTC offset in the current scenario ie taking into account daylight savings. Any ideas how this can be done using win32 APIs
Sounds like you want an API for searching the zoneinfo / tz database..?
Don't know if there is a library with precisely the interface you want. But reading it and searching it yourself would not be difficult. It's just a flat file database, text with one record per line.
来源：https://stackoverflow.com/questions/3002910/find-utc-offset-given-a-city