How to properly handle dates with Laravel?

So, I'm working with Laravel. My project is set to the TIMEZONE: UTC.

• When I consume my project's API on a Flutter mobile application, for example, I convert the dates received from the server in UTC to the user's local time zone (on mobile client).
• How can I do this for a traditional dynamic web application where the HTML is built on the Laravel server?

For that you will have to save the user's time zone in the database somewhere, so you can know it ahead of time. Unless you also bundle some js, that can change the dates later when js is run in the browser.

There other advanced tactics sites use to detect user's location, like the 'Accept-Language' header or analysing the ipaddress, you can research those if you like.