If it's life knowledge, health care and financial management, it's better to send it in the afternoon, because this kind of official WeChat account mainly focuses on middle-aged and elderly people, who are more leisure in the afternoon.

If it is for fitness, makeup, skin care, travel, study, etc. It is better to send it at night, because this official WeChat account mainly focuses on teenagers and is generally active at night.

In short, the time to send a message depends on the people who pay attention to the official WeChat account.