What is the situation that the number of health code days in Beijing is 0?

No more than one day. According to relevant data, Beijing takes the sampling day as the starting point for calculating the days of nucleic acid detection, and the results will be displayed on the sampling day. If it is less than one day, 0 days will be displayed. The number of days for nucleic acid detection of Health Treasure is calculated strictly according to the calendar day, with the sampling day as the starting point. When the test results are released at 0-6 o'clock every morning, sampling is usually completed the day before. Before 24: 00 on the same day, the date of nucleic acid detection of Health Treasure was displayed as 1 day, and it was displayed as 2 days after 24: 00. And so on.