How to update PA_PROJECT_PUB.UPDATE_TASK DFF attribute value

Hello ,

When we are updating the task attribute values, we are getting the below errors, Could you please help me on this issue.

Error: API Error while updating the Task: 1: The flex field values you have entered are invalid. (PROJECT=INVALID: Please enter date value 20-JAN-0012 in correct format: RRRR/MM/DD HH24:MI:SS)

Error: API Error while updating the Task: 2: PROJECT: '&PROJECT_ID';TASK: '&TASK_ID' ; The task has not been updated.

Below is the code

DECLARE

   l_msg_count               NUMBER;

   l_msg_data                VARCHAR2 (2000);

   l_return_status           VARCHAR2 (1);

   l_out_pa_task_id          NUMBER;

   l_out_pm_task_reference   VARCHAR2 (2000);