1. Open the Alipay application and log in to the account.
2. Locate and click the Health Code option on the home page or the bottom navigation bar.
3. On the health code page, find and select the option of "Claim of Residents' Health Records".
4. After entering the page of claiming residents' health records, look for options related to calendars or dates.
5. Click the calendar or date icon to enter the calendar page.
6. In the calendar page, find the date that needs to be modified and make the corresponding modification operation.
7. After finishing the modification, save the modification.