Provide a working example of API usage to update a cards details

When using the API to create a card it seems not yet to be possible to add all details while creating the card - details have to be added in a second step.

To Reproduce
use curl in PHP to set a due date (which is described differently in the API doc compared to the request the browser does when using the GUI: "duedate": "2019-12-24T19:29:30+00:00" in the doc, duedate = "2022-10-07T02:20:00.000Z", the tzdata is formed different).

Expected behavior
Updated card with the due date.

Not clear from doc: do all fields have to be set in this PUT-request? Do you have to submit the title again, even if not changed?
I get a 400 bad request in ~50 different code "ideas" I tried to use :)

Client details:

• OS: Linux on GUI, Linux on cli
• Browser Firefox, cURL
• Version [e.g. 22]
• Device:

Start by reviewing the API documentation and the curl/PHP request described in the issue, then compare its due-date format with the browser request from the GUI. Document a working card-update example and clarify whether unchanged fields such as the title are required; done means the example successfully updates a due date without a 400 response.