Error: The given string could not be parsed as a date/time when Carbon::parse processes regional date strings

Direct Resolution

To ensure database-stored UTC dates are displayed correctly according to config('app.timezone') without manual conversion on every retrieval, the recommended approach is to implement model accessors or casting within the Eloquent model, not necessarily a global scope.

Likely Explanation vs. Confirmed Facts

The error arises because Carbon::parse requires unambiguous format information for regional strings; it cannot infer the intended timezone solely from the string content. Confirmed fact: Database storage is typically UTC, necessitating explicit conversion upon retrieval for regional display.

Steps for Resolution

1. Ensure config('app.timezone') is correctly set in the application configuration.
2. In the relevant Eloquent model, define a custom accessor or use attribute casting to transform the UTC attribute into the application timezone upon access.
3. Verify that the incoming regional date strings are either standardized (e.g., ISO 8601) or parsed using Carbon::createFromFormat with the correct locale, rather than relying solely on Carbon::parse.

Diagnostic Detail Required

To refine the solution, confirm if the regional date strings are consistently formatted or if they vary widely across inputs.