fix millisecond error (#15203)

Author: teallarson

airbyte-webapp/src/packages/cloud/views/layout/MainView/MainView.tsx

@@ -65,11 +65,12 @@ const MainView: React.FC = (props) => {
     } else if (alertToShow === "trial") {
       const { trialExpiryTimestamp } = cloudWorkspace;
 
-      //calculate difference between timestamp (in epoch seconds) and now (in epoch seconds)
-      const trialRemainingSeconds = trialExpiryTimestamp ? trialExpiryTimestamp - Date.now() / 1000 : 0;
+      //calculate difference between timestamp (in epoch milliseconds) and now (in epoch milliseconds)
+      //empty timestamp is 0
+      const trialRemainingMilliseconds = trialExpiryTimestamp ? trialExpiryTimestamp - Date.now() : 0;
 
       //calculate days (rounding up if decimal)
-      const trialRemainingDays = Math.ceil(trialRemainingSeconds / (24 * 60 * 60));
+      const trialRemainingDays = Math.ceil(trialRemainingMilliseconds / (1000 * 60 * 60 * 24));
 
       return formatMessage({ id: "trial.alertMessage" }, { value: trialRemainingDays });
     }