Hi Vinayak Kulkarni,
After copying City Of Durham Company again from production to LB today,We observed that after creating event builder rule for MEDICARE we are getting below error while changing Employee Demographics data such as date of Birth , Status etc :-

Error LOG->
ErrorID : 0
ErrorSource : ControllerAppTier.Save->WORKTERRAControllerAppTier.Save->Employee.Save->Employee.UpdateEmployeeChangeStatus->EventBuilderRuleEngine.UpdateEventBuilderRuleEngineFromCriteria
ErrorMessage: Conversion failed when converting character string to smalldatetime data type.

NOTE: we are able to change employee data successfully after deleting MEDICARE event builder rule.
Can you please look into this , as we are blocked to test actual scenarios for which implementation is done.
CC-Aniruddha DevHrishikesh Deshpande