In Employee flow, Server error observed on Recommended plan screen on Checkout button.

PFA screen shot and error log.

Exception : SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM.
App Error Log : ControllerAppTier.GetData->BenAdminControllerAppTier.GetData->CreditPoolAllocationDeallocation.GetEmployerContribution->CreditPoolAllocationDeallocation.GetEligibleCreditPoolForEmployee->CreditPoolAllocationOnImport.FetchDemographicEligibilityForCreditPoolForSingleEmployee->GenericEligblityCheck.FetchDemographicEligibility
Employee ID : 11605
Action Name : Ex_PV_EnrollmentCart
Model : System.Web.Mvc.HandleErrorInfo
Controller : Exchange
Web Error Log : at WORKTERRA.BenAdmin.BenAdminControllerWebTier.GetData(ObjectType I_objectType, Hashtable I_criteria, Object I_context, Boolean I_mode, Boolean I_needCollection)
at WORKTERRA.BenAdmin.Areas.UserDetails.Models.ElectionSummaryPVModel.PopulateElectionSummary(String strEffectiveDate, Boolean IsExchange, Boolean IsExchangeTemp)
at WORKTERRA.BenAdmin.Areas.UserDetails.Controllers.ExchangeController.Ex_PV_EnrollmentCart(String EffectiveDate, Boolean IsRecommended, Boolean IsExchange)
at lambda_method(Closure , ControllerBase , Object[] )
at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.<>c_DisplayClass13.b_10()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)