In short
China’s regional visa-free system includes a 30-day Hainan policy for ordinary-passport holders from 61 listed countries traveling for tourism, business, visits, family or medical care, exhibitions, or sports, but not work or study. The page lists the eligible countries and says the stay clock starts at midnight on the day after entry. Separate regional and group schemes are described on the official page; travelers should check the current conditions and designated areas before departure.
The 30-day Hainan route
Ordinary-passport holders from 61 listed countries may enter Hainan for up to 30 days for tourism, business, visits, family or medical care, exhibitions, or sports. The policy does not cover work or study.
Stay counting and other schemes
The stay clock starts at midnight on the day after entry. The official page also describes separate regional and group schemes with their own conditions and designated activity areas; travelers should check the current rules before departure.