escalation workflow rule for tickets

Hi,

I am trying to create an escalation rule for tickets. But the rule is not working.

Following are the details:-

Business Object: Tickets

Timing:Scheduled

Event :Escalated on

Relevant time: on

DEFINE CONDITIONS:

Initial review due    Greater than    1.6.2016

OR

Initial review completed    Greater than   3.6.2016

DEFINE ACTION

Rule type: Action

Select action: Escalate

then activate and finish.

However, the rule is not working. Cannot understand where i am getting stuck. Pls help