During the epidemic, the health code is to prove the health and safety status of a person vaccinated and his area. If a person leaves the local area and goes to a risk area, it is obvious that the health code will change. According to the calculation of big data, the health code will change from red to yellow or even red, so the health code is real-time, not forever.
Health codes are updated at any time. If you look carefully, there is time on the health code in Alipay or WeChat. If you are in a high-risk area, your health code will turn red! Our health code has always been green, mainly because we don't go out, or in high-risk areas where there is no epidemic.