MC-19873: [Sample Data Function Test] Sample data test failed with Incorrect final price

Author: dhorytskyi

app/code/Magento/CatalogRule/Model/Indexer/ReindexRuleProduct.php

@@ -101,7 +101,9 @@ public function execute(Rule $rule, $batchCount, $useAdditionalTable = false)
             $scopeTz = new \DateTimeZone(
                 $this->localeDate->getConfigTimezone(ScopeInterface::SCOPE_WEBSITE, $websiteId)
             );
-            $fromTime = (new \DateTime($rule->getFromDate(), $scopeTz))->getTimestamp();
+            $fromTime = $rule->getFromDate()
+                ? (new \DateTime($rule->getFromDate(), $scopeTz))->getTimestamp()
+                : 0;
             $toTime = $rule->getToDate()
                 ? (new \DateTime($rule->getToDate(), $scopeTz))->getTimestamp() + IndexBuilder::SECONDS_IN_DAY - 1
                 : 0;