Task_getCompletionDeadline
Get completion deadline (should be carried out before) of a specific task.
Syntax 
Task_getCompletionDeadline(TaskResourceID)
Arguments
TaskResourceID: is a number. It is resource id of task
Return type
UTC date time array
Examples
array taskDeadLine = Task_getCompletionDeadline(37245949);
print(taskDeadLine); //{2011,10,9,9,48,0,0,40}