What does the yellow code of time and space companion mean?

The yellow code of space-time companion number indicates that my phone number and confirmation number have stayed together for more than 10 minute in the same space-time grid (the range is 800m*800m), and the cumulative stay time of any number in recent 14 days has exceeded 30 hours, and the found number is the space-time companion number. My green health code will turn into a yellow code with warning nature, and will be marked as "time companion" by the system.

For example, an infected person has been to a place in 14 days, and your trajectory has crossed with him in this 14 day. Whether it is a physical brush or a "drift" in communication signals, it may be considered as a "time-space companion".

Method of turning green code

Health code yellow code personnel and time-space associated risk personnel who have received SMS reminders from the Municipal Public Security Bureau and the Municipal Center for Disease Control and Prevention should immediately report to the community and conduct nucleic acid testing. Please stay at home and don't go out until you get a nucleic acid negative result. If there are more than two negative reports of nucleic acid detection with an interval of 24 hours in the first three days, you can automatically turn green.