Currently, it is not possible to filter the leads based on the date they were marked as qualified.

You can find the date the lead was marked qualified by checking the ‘Activity Log’ section on the lead details page.

Please check the image below.

So there is no way to use a filter to search leads qualified on specific Dates?

You may use the filter icon in the active leads pipeline and you may refer to the screenshot below. You can just put the dates that you desire.

Reference Video: