How do I just download the latest analog based on Date?

To download the latest file only if it has been modified since a specific date, use the If-Modified-Since command. Cache the previous date, and the server will download the file only if it has been updated since that date.

Note: If the specified date is in the future, the file will always be downloaded. The date must fall between the current time and the file's last modified time.

Use the following curl command: