The Get Tasks query parameters due, followUp and created are used inconsistently in the REST API:

For the Get Tasks GET query, they have to be used without Date suffix, e.g. GET /task?due=2013-01-23T13:49:42

For the Get Tasks POST query, they have to be used with Date suffix, e.g.
POST /task
{
"dueDate": "2013-01-23T13:49:42"
}

The same problem exists with the created (GET) and the createdOn (POST) parameter.

Currently, the REST documentation for POST is incorrect, indicating the use of all three parameters without any suffix.