ground postDate

postDate granularity is 'date' (not timestamp). This should be handled
automatically by the database, but in situations where the column is a
timestamp instead of just date, we want to make sure we have the same
time (00:00:00).

modules/minigl/src/main/java/org/jpos/gl/GLSession.java

@@ -627,7 +627,7 @@ public void post (Journal journal, GLTransaction txn)
         txn.setJournal (journal);
         txn.setTimestamp (new Date());
         if (txn.getPostDate() == null)
-            txn.setPostDate (txn.getTimestamp());
+            txn.setPostDate (Util.floor(txn.getTimestamp()));
         else
             invalidateCheckpoints (txn);
         Collection rules = getRules (txn);