function calculate($epoch = NULL)
 {
     if ($this->getUserObject() == FALSE) {
         return FALSE;
     }
     if ($this->getPayPeriodObject() == FALSE) {
         return FALSE;
     }
     if ($epoch == NULL or $epoch == '') {
         $epoch = TTDate::getTime();
     }
     //Use User Termination Date instead of ROE.
     if ($this->getUserObject()->getTerminationDate() != '' and $this->getUserObject()->getTerminationDate() >= $this->getPayPeriodObject()->getStartDate() and $this->getUserObject()->getTerminationDate() <= $this->getPayPeriodObject()->getEndDate()) {
         Debug::text('User has been terminated in this pay period!', __FILE__, __LINE__, __METHOD__, 10);
         $is_terminated = TRUE;
     } else {
         $is_terminated = FALSE;
     }
     //Allow generating pay stubs for employees who have any status, but if its not ID=10
     //Then the termination date must fall within the start/end date of the pay period, or after the end date (if its the current pay period)
     //The idea here is to allow employees to be marked terminated (or on leave) and still get their previous or final pay stub generated.
     //Also allow pay stubs to be generated in pay periods *before* their termination date.
     if ($this->getUserObject()->getStatus() != 10 and ($is_terminated == FALSE and ($this->getUserObject()->getTerminationDate() == '' or $this->getUserObject()->getTerminationDate() < $this->getPayPeriodObject()->getStartDate()))) {
         Debug::text('Pay Period is after users termination date (' . $this->getUserObject()->getTerminationDate() . '), or no termination date is set...', __FILE__, __LINE__, __METHOD__, 10);
         return FALSE;
     }
     Debug::text('User Id: ' . $this->getUser() . ' Pay Period End Date: ' . TTDate::getDate('DATE+TIME', $this->getPayPeriodObject()->getEndDate()), __FILE__, __LINE__, __METHOD__, 10);
     $generic_queue_status_label = $this->getUserObject()->getFullName(TRUE) . ' - ' . TTi18n::gettext('Pay Stub');
     $pay_stub = TTnew('PayStubFactory');
     $pay_stub->StartTransaction();
     $old_pay_stub_id = NULL;
     if ($this->getEnableCorrection() == TRUE) {
         Debug::text('Correction Enabled!', __FILE__, __LINE__, __METHOD__, 10);
         $pay_stub->setTemp(TRUE);
         //Check for current pay stub ID so we can compare against it.
         $pslf = TTnew('PayStubListFactory');
         $pslf->getByUserIdAndPayPeriodId($this->getUser(), $this->getPayPeriod());
         if ($pslf->getRecordCount() > 0) {
             $old_pay_stub_id = $pslf->getCurrent()->getId();
             Debug::text('Comparing Against Pay Stub ID: ' . $old_pay_stub_id, __FILE__, __LINE__, __METHOD__, 10);
         }
     }
     $pay_stub->setUser($this->getUser());
     $pay_stub->setPayPeriod($this->getPayPeriod());
     $pay_stub->setCurrency($this->getUserObject()->getCurrency());
     $pay_stub->setStatus(10);
     //New
     if ($is_terminated == TRUE) {
         Debug::text('User is Terminated, assuming final pay, setting End Date to terminated date: ' . TTDate::getDate('DATE+TIME', $this->getUserObject()->getTerminationDate()), __FILE__, __LINE__, __METHOD__, 10);
         $pay_stub->setStartDate($pay_stub->getPayPeriodObject()->getStartDate());
         $pay_stub->setEndDate($this->getUserObject()->getTerminationDate());
         //Use the PS generation date instead of terminated date...
         //Unlikely they would pay someone before the pay stub is generated.
         //Perhaps still use the pay period transaction date for this too?
         //Anything we set won't be correct for everyone. Maybe a later date is better though?
         //Perhaps add to the user factory under Termination Date a: "Final Transaction Date" for this purpose?
         //Use the end of the current date for the transaction date, as if the employee is terminated
         //on the same day they are generating the pay stub, the transaction date could be before the end date
         //as the end date is at 11:59PM
         //For now make sure that the transaction date for a terminated employee is never before their termination date.
         if (TTDate::getEndDayEpoch(TTDate::getTime()) < $this->getUserObject()->getTerminationDate()) {
             $pay_stub->setTransactionDate($this->getUserObject()->getTerminationDate());
         } else {
             $pay_stub->setTransactionDate(TTDate::getEndDayEpoch(TTDate::getTime()));
         }
     } else {
         Debug::text('User Termination Date is NOT set, assuming normal pay.', __FILE__, __LINE__, __METHOD__, 10);
         $pay_stub->setDefaultDates();
     }
     //This must go after setting advance
     if ($this->getEnableCorrection() == FALSE and $pay_stub->IsUniquePayStub() == FALSE) {
         Debug::text('Pay Stub already exists', __FILE__, __LINE__, __METHOD__, 10);
         $this->CommitTransaction();
         UserGenericStatusFactory::queueGenericStatus($generic_queue_status_label, 20, TTi18n::gettext('Pay Stub for this employee already exists, skipping...'), NULL);
         return FALSE;
     }
     if ($pay_stub->isValid() == TRUE) {
         $pay_stub->Save(FALSE);
         $pay_stub->setStatus(25);
         //Open
     } else {
         Debug::text('Pay Stub isValid failed!', __FILE__, __LINE__, __METHOD__, 10);
         UserGenericStatusFactory::queueGenericStatus($generic_queue_status_label, 10, $pay_stub->Validator->getTextErrors(), NULL);
         $this->FailTransaction();
         $this->CommitTransaction();
         return FALSE;
     }
     $pay_stub->loadPreviousPayStub();
     $user_date_total_arr = $this->getWageObject()->getUserDateTotalArray();
     if (isset($user_date_total_arr['entries']) and is_array($user_date_total_arr['entries'])) {
         foreach ($user_date_total_arr['entries'] as $udt_arr) {
             //Allow negative amounts so flat rate premium policies can reduce an employees wage if need be.
             if ($udt_arr['amount'] != 0) {
                 Debug::text('Adding Pay Stub Entry: ' . $udt_arr['pay_stub_entry'] . ' Amount: ' . $udt_arr['amount'], __FILE__, __LINE__, __METHOD__, 10);
                 $pay_stub->addEntry($udt_arr['pay_stub_entry'], $udt_arr['amount'], TTDate::getHours($udt_arr['total_time']), $udt_arr['rate']);
             } else {
                 Debug::text('NOT Adding ($0 amount) Pay Stub Entry: ' . $udt_arr['pay_stub_entry'] . ' Amount: ' . $udt_arr['amount'], __FILE__, __LINE__, __METHOD__, 10);
             }
         }
     } else {
         //No Earnings, CHECK FOR PS AMENDMENTS next for earnings.
         Debug::text('NO TimeSheet EARNINGS ON PAY STUB... Checking for PS amendments', __FILE__, __LINE__, __METHOD__, 10);
     }
     //Get all PS amendments and Tax / Deductions so we can determine the proper order to calculate them in.
     $psalf = TTnew('PayStubAmendmentListFactory');
     $psalf->getByUserIdAndAuthorizedAndStartDateAndEndDate($this->getUser(), TRUE, $this->getPayPeriodObject()->getStartDate(), $this->getPayPeriodObject()->getEndDate());
     $udlf = TTnew('UserDeductionListFactory');
     $udlf->getByCompanyIdAndUserId($this->getUserObject()->getCompany(), $this->getUserObject()->getId());
     if (getTTProductEdition() >= TT_PRODUCT_ENTERPRISE and $this->getUserObject()->getCompanyObject()->getProductEdition() >= TT_PRODUCT_ENTERPRISE) {
         $uelf = TTnew('UserExpenseListFactory');
         $uelf->getByUserIdAndAuthorizedAndStartDateAndEndDate($this->getUser(), TRUE, $this->getPayPeriodObject()->getStartDate(), $this->getPayPeriodObject()->getEndDate());
         Debug::text('Total User Expenses: ' . $uelf->getRecordCount(), __FILE__, __LINE__, __METHOD__, 10);
     } else {
         $uelf = FALSE;
     }
     $deduction_order_arr = $this->getOrderedDeductionAndPSAmendment($udlf, $psalf, $uelf);
     if (is_array($deduction_order_arr) and count($deduction_order_arr) > 0) {
         foreach ($deduction_order_arr as $calculation_order => $data_arr) {
             Debug::text('Found PS Amendment/Deduction: Type: ' . $data_arr['type'] . ' Name: ' . $data_arr['name'] . ' Order: ' . $calculation_order, __FILE__, __LINE__, __METHOD__, 10);
             if (isset($data_arr['obj']) and is_object($data_arr['obj'])) {
                 if ($data_arr['type'] == 'UserDeductionListFactory') {
                     $ud_obj = $data_arr['obj'];
                     //Determine if this deduction is valid based on start/end dates.
                     //Determine if this deduction is valid based on min/max length of service.
                     //Determine if this deduction is valid based on min/max user age.
                     if ($ud_obj->getCompanyDeductionObject()->isActiveDate($pay_stub->getPayPeriodObject()->getEndDate()) == TRUE and $ud_obj->getCompanyDeductionObject()->isActiveLengthOfService($this->getUserObject(), $pay_stub->getPayPeriodObject()->getEndDate()) == TRUE and $ud_obj->getCompanyDeductionObject()->isActiveUserAge($this->getUserObject(), $pay_stub->getPayPeriodObject()->getEndDate()) == TRUE and $ud_obj->getCompanyDeductionObject()->inApplyFrequencyWindow($pay_stub->getPayPeriodObject()->getStartDate(), $pay_stub->getPayPeriodObject()->getEndDate(), $this->getUserObject()->getHireDate(), $this->getUserObject()->getTerminationDate(), $this->getUserObject()->getBirthDate()) == TRUE) {
                         $amount = $ud_obj->getDeductionAmount($this->getUserObject()->getId(), $pay_stub, $this->getPayPeriodObject());
                         Debug::text('User Deduction: ' . $ud_obj->getCompanyDeductionObject()->getName() . ' Amount: ' . $amount . ' Calculation Order: ' . $ud_obj->getCompanyDeductionObject()->getCalculationOrder(), __FILE__, __LINE__, __METHOD__, 10);
                         //Allow negative amounts, so they can reduce previously calculated deductions or something.
                         if (isset($amount) and $amount != 0) {
                             $pay_stub->addEntry($ud_obj->getCompanyDeductionObject()->getPayStubEntryAccount(), $amount, NULL, NULL, $ud_obj->getCompanyDeductionObject()->getPayStubEntryDescription());
                         } else {
                             Debug::text('Amount is 0, skipping...', __FILE__, __LINE__, __METHOD__, 10);
                         }
                     }
                     unset($amount, $ud_obj);
                 } elseif ($data_arr['type'] == 'PayStubAmendmentListFactory') {
                     $psa_obj = $data_arr['obj'];
                     Debug::text('Found Pay Stub Amendment: ID: ' . $psa_obj->getID() . ' Entry Name ID: ' . $psa_obj->getPayStubEntryNameId() . ' Type: ' . $psa_obj->getType(), __FILE__, __LINE__, __METHOD__, 10);
                     $amount = $psa_obj->getCalculatedAmount($pay_stub);
                     if (isset($amount) and $amount != 0) {
                         Debug::text('Pay Stub Amendment Amount: ' . $amount, __FILE__, __LINE__, __METHOD__, 10);
                         //Keep in mind this causes pay stubs to be re-generated every time, as this modifies the updated time
                         //to slightly more then the pay stub creation time.
                         $psa_obj->setStatus(52);
                         //InUse
                         if ($psa_obj->isValid()) {
                             $pay_stub->addEntry($psa_obj->getPayStubEntryNameId(), $amount, $psa_obj->getUnits(), $psa_obj->getRate(), $psa_obj->getDescription(), $psa_obj->getID(), NULL, NULL, $psa_obj->getYTDAdjustment());
                             $psa_obj->Save();
                         }
                     } else {
                         Debug::text('bPay Stub Amendment Amount is not set...', __FILE__, __LINE__, __METHOD__, 10);
                     }
                     unset($amount, $psa_obj);
                 } elseif ($data_arr['type'] == 'UserExpenseListFactory') {
                     $ue_obj = $data_arr['obj'];
                     Debug::text('Found User Expense: ID: ' . $ue_obj->getID() . ' Expense Policy ID: ' . $ue_obj->getExpensePolicy(), __FILE__, __LINE__, __METHOD__, 10);
                     $amount = $ue_obj->getReimburseAmount();
                     if (isset($amount) and $amount != 0) {
                         Debug::text('User Expense reimbursable Amount: ' . $amount, __FILE__, __LINE__, __METHOD__, 10);
                         $pay_stub->addEntry($ue_obj->getExpensePolicyObject()->getPayStubEntryAccount(), $amount, NULL, NULL, NULL, NULL, NULL, NULL, FALSE, $ue_obj->getID());
                         //Keep in mind this causes pay stubs to be re-generated every time, as this modifies the updated time
                         //to slightly more then the pay stub creation time.
                         $ue_obj->setStatus(35);
                         //InUse
                         $ue_obj->Save();
                     } else {
                         Debug::text('bUser Expense Amount is not set...', __FILE__, __LINE__, __METHOD__, 10);
                     }
                     unset($amount, $ue_obj);
                 }
             }
         }
     }
     unset($deduction_order_arr, $calculation_order, $data_arr);
     $pay_stub_id = $pay_stub->getId();
     $pay_stub->setEnableProcessEntries(TRUE);
     $pay_stub->processEntries();
     if ($pay_stub->isValid() == TRUE) {
         Debug::text('Pay Stub is valid, final save.', __FILE__, __LINE__, __METHOD__, 10);
         $pay_stub->setEnableCalcYTD(TRUE);
         //When recalculating old pay stubs in the middle of the year, we need to make sure YTD values are updated.
         $pay_stub->Save();
         if ($this->getEnableCorrection() == TRUE) {
             if (isset($old_pay_stub_id)) {
                 Debug::text('bCorrection Enabled - Doing Comparison here', __FILE__, __LINE__, __METHOD__, 10);
                 PayStubFactory::CalcDifferences($pay_stub_id, $old_pay_stub_id);
             }
             //Delete newly created temp paystub.
             //This used to be in the above IF block that depended on $old_pay_stub_id
             //being set, however in cases where the old pay stub didn't exist
             //TimeTrex wouldn't delete these temporary pay stubs.
             //Moving this code outside that IF statement so it only depends on EnableCorrection()
             //to be TRUE should fix that issue.
             $pslf = TTnew('PayStubListFactory');
             $pslf->getById($pay_stub_id);
             if ($pslf->getRecordCount() > 0) {
                 $tmp_ps_obj = $pslf->getCurrent();
                 $tmp_ps_obj->setDeleted(TRUE);
                 $tmp_ps_obj->Save();
                 unset($tmp_ps_obj);
             }
         }
         $pay_stub->CommitTransaction();
         UserGenericStatusFactory::queueGenericStatus($generic_queue_status_label, 30, NULL, NULL);
         return TRUE;
     }
     Debug::text('Pay Stub is NOT valid returning FALSE', __FILE__, __LINE__, __METHOD__, 10);
     UserGenericStatusFactory::queueGenericStatus($generic_queue_status_label, 10, $pay_stub->Validator->getTextErrors(), NULL);
     $pay_stub->FailTransaction();
     //Reduce transaction count by one.
     $pay_stub->CommitTransaction();
     return FALSE;
 }