Isn't the health certificate valid for one year? Why should it be three months ago?

The validity period of health certificate is not necessarily one year, but depends on the regulations of different regions and industries. Therefore, the validity period of health certificates in some regions and industries may be shorter than one year, such as food processing industry and cleaning industry, and the validity period of health certificates in these industries may only be 6 months or 1 year.

In addition, even in the same region and industry, the validity period of health certificate may be uncertain. For example, the validity period of health certificates in some areas may be determined according to local policies, regulations and relevant regulations, so it needs to be confirmed according to specific circumstances.

In addition, even if the health certificate is within the validity period, if it is not renewed beyond the validity period, its probative power will be greatly reduced, and it may even lose its probative effect. Therefore, in order to ensure the validity of the health certificate, it is recommended to update it within the specified time.