To get the results that match the website you'll need to use the region filter.

https://api.themoviedb.org/3/movie/upcoming?api_key=###&region=CA|US

As an example, but that's for me here in Canada, obviously depending on your region it could be something different.

I am using the Region filter('BR') but the request does not show movies launching before 30/03/2017 although on Brazil's upcoming movies webpage there are movies scheduled for next week.

EDIT: It seems like the movies went from Upcoming to Now Playing. Does the Database update itself every saturday?

Looks like the date parsing bug that I am aware of rearing it's head.

https://api.themoviedb.org/3/movie/upcoming?api_key=###&region=BR

You can refresh the website and or the API and you'll see you're getting 2 sets of results randomly. I am aware of this bug and plan to get to it either end of this week or the following week. If you pay attention, it's the min/max dates that flip weeks. That's why you're seeing the different data.

Exactly! I am also receiving random amounts of data. I'm looking forward for the fix. Thanks!