In May this year, Jiangyin was closed for several days due to the epidemic. From what date to what date?

In May this year, Jiangyin was closed due to the epidemic from 4th to 22nd 18 days. On May 3, Jiangyin City found a number of people with abnormal nucleic acid detection when conducting nucleic acid detection on people who should have completed the inspection in Zhouzhuang Town, and began to implement control on May 4. On May 22nd, the control ended, the epidemic ended and the city was lifted. A * * * is 18 days. So in May this year, Jiangyin was closed for 18 days from 4th to 22nd due to the epidemic.