Contribution start date and end dates are not respected

Steps to replicate :

-------------------------

1. Create a contribution page with end date earlier than today.
2. Go to live mode, the page is still active and nothing changes.
3. Similarly, if the start date is set in future, that's also not disabling the page.

Users are getting confused as to why the contribution continued to accept payments after the end date. There is no way to set a contribution to end without manually going in to inactivate.