refactor: migrate JodaTime to java.time (rebuild on subdate2 ab96cfc)

Complete the JodaTime -> java.time migration across 30 files on the
correct subdate2 base. No org.joda references remain.

src/engine/db/handlers/dbNPCHandler.java

@@ -15,7 +15,8 @@ import engine.mbEnums;
 import engine.mbEnums.ProfitType;
 import engine.objects.NPC;
 import engine.objects.NPCProfits;
-import org.joda.time.DateTime;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
 import org.pmw.tinylog.Logger;
 
 import java.sql.Connection;
@@ -240,7 +241,7 @@ public class dbNPCHandler extends dbHandlerBase {
         }
     }
 
-    public boolean updateUpgradeTime(NPC npc, DateTime upgradeDateTime) {
+    public boolean updateUpgradeTime(NPC npc, LocalDateTime upgradeDateTime) {
 
         try (Connection connection = DbManager.getConnection();
              PreparedStatement preparedStatement = connection.prepareStatement("UPDATE obj_npc SET upgradeDate=? "
@@ -249,7 +250,7 @@ public class dbNPCHandler extends dbHandlerBase {
             if (upgradeDateTime == null)
                 preparedStatement.setNull(1, java.sql.Types.DATE);
             else
-                preparedStatement.setTimestamp(1, new java.sql.Timestamp(upgradeDateTime.getMillis()));
+                preparedStatement.setTimestamp(1, new java.sql.Timestamp(upgradeDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli()));
 
             preparedStatement.setInt(2, npc.getObjectUUID());