The formatDate function currently processes date formats for SVG render templates and credential information. However, it needs improvement to handle all possible date format cases robustly while ensuring it does not break when encountering other data values such as strings or numbers.

Requirements:

1. Enhance the formatDate function to correctly handle all valid date formats.
2. Ensure the function gracefully handles and preserves other data types (e.g., strings, numbers) without unintended changes.
3. Conduct thorough testing to confirm no regressions in SVG render templates and credential info.