The civil administration health code is updated once every three days. Under normal circumstances, the health code needs to be updated every three days in the case of green code. At least the sequential boarding of health codes can be postponed within the validity period, otherwise it will become yellow codes.
However, different regions have different regulations on health codes. Some areas are updated once in a while, and some areas have no time limit and do not need to be updated, as the case may be.