If you or your entire coalition have obtained the required Victory Points (VP), the game will end at the next game day change, not the real-time day change. This gives you additional time to earn more VPs, and your enemies will have a chance to thwart your progress.
Important Note: If you lose Victory Points before the game day change, the game will consider the points you have at the moment of the game day change. Therefore, maintaining your Victory Points until the game day change is crucial to ensure your victory.
Remember, the game day change is different from the real-world day change, and you can check the game day change from within the game itself.