Timestamp queries not working as expected

As the attached test case is showing the following queries don't return the expected result:
1) Modify a document, retrieve the modificationDate from the database and then search for documents with the same title and this modification time
(using the format : yyyy-MM-dd HH:mm:ss ) . The document is not found.

• When searching for documents modified before actual modificationTime + 1 second the document is found
  2) Search for documents modified before actual modificationTime + 1 second but using the org.nuxeo.ecm.core.query.sql.model to build the query ( WhereClause).
  When the query is build the modificationTime is formated with the time zone and the document is not found.