Jira API 3 Create Issue with CustomField Blank date

[S]

Hi,

I'm creating issue using API 3

I have a few custom fields...one of them has data type "Date"... 

When I try to post "" or Null from my C# code its throws error "BadRequest"...

CustomField_100 is date data type

How can I deal with this situation? 

{"update":{},"fields":{"summary":"Testing creation","project":{"key":"HelloWorld"},"issuetype":{"id":35},"CustomField_100":{"value":""}}}

[Soeren.Seyfert]

I have the same problem. Have you found a solution in the meantime?