Besides the date format, as Khun Teerawat mentioned, an example of how to fill out the case record form on the date of the visit and the date of the informed consent form signed should be provided so that any confusion that might occur during data collection and data entry can be avoided.
The corrected version should appear on the CRF as follows,
Date of Visit: ________________________ (DD/MMM/YYYY, e.g., 01/JAN/2024)
Date of the informed consent form signed: ____________________________ (DD/MMM/YYYY, e.g., 01/JAN/2024)
Also, I agree with Dr. Teeraboon, who mentioned above, that we should not gather the date of birth data if it is unnecessary. The Siriraj Medical Research Center (SIMR), where I worked, has a protocol that if the date of birth needs to be collected, the researcher can collect only the month and the year, not the date, to avoid indirectly identifiable information.