I have tried using all the date formats but I am unable to save the DueBy date and the Created Date

Any clue where I confirm those fields names? And what exactly is the date format? 

 

My configuration has no sites so all the sites are deleted and not required.

Using the API the technician group is saved successfully while the technician is not being saved

I have tried both the username and the email but with no luck

 

The documentation is providing the request fields with no date fields' names. Where can I find them?

 

Thanks a lot