JOI Open Contest 2022 will be held from Sunday, July 3, 04:00 UTC to Monday, July 4, 04:00 UTC. You can start any time and the duration is basically 5 hours. Note that the duration becomes shorter if you start after Sunday, July 3, 23:00 UTC, i.e. less than 5 hours before the contest ends.
There will be 3 tasks, and the maximum score for each task is 100 points. Since this is an IOI-style contest, there may be some subtasks. Each submitted source program must be written only in C++. Problem statements will be provided both in Japanese and in English. You can find more details in the contest page.
Good luck and have fun!