If you want to preserve the timezone, you will need a timezone package, because the standard DateTime does not have it.

However, you can use the normal DateTime with UTC and use a package I created to parse many formats https://pub.dev/packages/any_date

See my comment here: https://stackoverflow.com/a/78357473/7128868

You still need to think about ambiguous cases, such as 01/02/03, which can be 2 Jan or 1 Feb depending on American format or not, for example.

But the package will help you with that as well.