Edit Task > Assign Date field use case ?

Summary:

What's the use of this field ?

Content (please ensure you mask any confidential information):

Hello,

As an HR, I have possibility to edit a task. There's a field for "Assign Date" but when I try changing that, it doesn't seem to reflect anywhere / do anything.

For example here, I have a task that was automatically assigned to a worker on April 10th.

I've tried changing the date to a later date, for example April 15th, thinking that this task will only then becomes available for my worker on April 15th.

But when I connect as my worker, that task is still open on April 10th and I can act on it.