Could you provide exact URL of your API calls (without API key) and the dates that you think are wrong for both movies?

Hi, thanks for response.

Please review the below link:
https://api.themoviedb.org/3/movie/upcoming?api_key=***&language=en-US&page=1&region=US {"release_date": "2019-07-19"}
http://api.themoviedb.org/3/movie/420818?api_key=***&language=en-US&append_to_response=videos {"release_date": "2019-07-12"}

Thanks again.

See here:
https://www.themoviedb.org/movie/420818-the-lion-king/edit?active_nav_item=release_information

2019-07-12 - China = World Premiere (first release date in the world)
2019-07-19 - USA = USA premiere - (upcoming in &region=US)

If you use upcoming without setting the &region=US, will see that the date changes to the date of China.
https://api.themoviedb.org/3/movie/upcoming?api_key=[MY_KEY]&language=en-US&page=1

I see!

The first API method "movie/upcoming" lets you filter release dates with "&region=" parameter just to US, so the only release date you get really is 2019-07-19, which is the only release date available for US (see the method description here).

The second API method "movie" however is just generic method to get details of the movie, which isn't designed to let you filter regional data. So the release date this method returns is the world premiere, in this case in China on 2019-07-12 (see the method description here).

If you need to get specific regional release date with the "movie" method, you need to use "&append_to_response=release_date" parameter. That way you will get all 39 release dates for that movie and you can look for the one you need:

https://api.themoviedb.org/3/movie/420818?api_key=###&language=en-US&append_to_response=release_dates,videos