How to calculate the isolation date in general?

Legal analysis: the isolation time is determined according to the infectivity of infectious diseases. For example, COVID-19 is contagious within 14 days, so it needs to be quarantined for 14 days. Another example is that H 1N 1 is contagious within 7 days, so it needs to be isolated for 7 days. Chickenpox 14 days, mumps for 5 days, and so on, all have different isolation times. The isolation time is counted from the first day of onset, or 1 and 14, which is the last day of isolation period.

Legal basis: People's Republic of China (PRC) Law on the Prevention and Control of Infectious Diseases.

Article 42 In the event of an outbreak or epidemic of infectious diseases, the local people's governments at or above the county level shall immediately organize forces to carry out prevention and control in accordance with the prevention and control plan and cut off the transmission route of infectious diseases. When necessary, the following emergency measures can be taken and announced after being approved by the people's government at the next higher level: (1) restricting or stopping performances in markets, theaters or other places where people gather; (2) suspension of work, business or classes; (three) closed or sealed public drinking water sources, food and related items contaminated by infectious disease pathogens; (4) controlling or culling wild animals, domestic animals and poultry infected with the epidemic; (five) closed places that may cause the spread of infectious diseases.

Article 45 In the event of an outbreak or epidemic of infectious diseases, the State Council has the right to urgently mobilize personnel or reserve materials and temporarily requisition houses, vehicles and related facilities and equipment throughout the country or across provinces, autonomous regions and municipalities directly under the Central Government.