Thank you for this report and for the test. Here is the same test in one class format (please use this format in your posts when possible). Build 2.3.7_10 fixes this time parsing issue.
import static org.junit.Assert.*;
import java.io.*;
import java.util.*;
import javax.jdo.annotations.*;
import javax.persistence.*;
import org.junit.*;
public class T737 {
@Test
public void test() {
EntityManagerFactory emf =
Persistence.createEntityManagerFactory("objectdb:$objectdb/db/test.tmp;drop");
EntityManager em = emf.createEntityManager();
Calendar cal1 = new GregorianCalendar(2012, Calendar.MARCH, 29, 0, 5); //fives after midnight
Calendar cal2 = new GregorianCalendar(2012, Calendar.MARCH, 29, 0, 10); //ten after midnight
Calendar cal3 = new GregorianCalendar(2012, Calendar.MARCH, 29, 0, 30); //thrity after midnight
Calendar cal4 = new GregorianCalendar(2012, Calendar.MARCH, 29, 1, 5); //fives after one
Calendar cal5 = new GregorianCalendar(2012, Calendar.MARCH, 29, 1, 30); //thirty after one
Calendar cal6 = new GregorianCalendar(2012, Calendar.MARCH, 29, 2, 15); //quarter after two
Calendar cal7 = new GregorianCalendar(2012, Calendar.MARCH, 29, 3, 15);
Calendar cal8 = new GregorianCalendar(2012, Calendar.MARCH, 29, 4, 15);
Calendar cal9 = new GregorianCalendar(2012, Calendar.MARCH, 29, 5, 15);
Calendar cal10 = new GregorianCalendar(2012, Calendar.MARCH, 29, 6, 15);
Calendar cal11 = new GregorianCalendar(2012, Calendar.MARCH, 29, 7, 15);
Calendar cal12 = new GregorianCalendar(2012, Calendar.MARCH, 29, 8, 15);
Calendar cal13 = new GregorianCalendar(2012, Calendar.MARCH, 29, 9, 15);
Calendar cal14 = new GregorianCalendar(2012, Calendar.MARCH, 29, 10, 15);
Calendar cal15 = new GregorianCalendar(2012, Calendar.MARCH, 29, 11, 15);
Calendar cal16 = new GregorianCalendar(2012, Calendar.MARCH, 29, 12, 3);
Calendar cal17 = new GregorianCalendar(2012, Calendar.MARCH, 29, 12, 17);
Calendar cal18 = new GregorianCalendar(2012, Calendar.MARCH, 29, 12, 37);
Calendar cal19 = new GregorianCalendar(2012, Calendar.MARCH, 29, 13, 15);
Calendar cal20 = new GregorianCalendar(2012, Calendar.MARCH, 29, 14, 15);
Calendar cal21 = new GregorianCalendar(2012, Calendar.MARCH, 29, 15, 15);
Calendar cal22 = new GregorianCalendar(2012, Calendar.MARCH, 29, 16, 15);
em.getTransaction().begin();
CDI cdi1 = new CDI("first1", "last1", cal1.getTime());
CDI cdi2 = new CDI("first2", "last2", cal2.getTime());
CDI cdi3 = new CDI("first3", "last3", cal3.getTime());
CDI cdi4 = new CDI("first4", "last4", cal4.getTime());
CDI cdi5 = new CDI("first5", "last5", cal5.getTime());
CDI cdi6 = new CDI("first6", "last6", cal6.getTime());
CDI cdi7 = new CDI("first7", "last7", cal7.getTime());
CDI cdi8 = new CDI("first8", "last8", cal8.getTime());
CDI cdi9 = new CDI("first9", "last9", cal9.getTime());
CDI cdi10 = new CDI("first10", "last10", cal10.getTime());
CDI cdi11 = new CDI("first11", "last11", cal11.getTime());
CDI cdi12 = new CDI("first12", "last12", cal12.getTime());
CDI cdi13 = new CDI("first13", "last13", cal13.getTime());
CDI cdi14 = new CDI("first14", "last14", cal14.getTime());
CDI cdi15 = new CDI("first15", "last15", cal15.getTime());
CDI cdi16 = new CDI("first16", "last16", cal16.getTime());
CDI cdi17 = new CDI("first17", "last17", cal17.getTime());
CDI cdi18 = new CDI("first18", "last18", cal18.getTime());
CDI cdi19 = new CDI("first19", "last19", cal19.getTime());
CDI cdi20 = new CDI("first20", "last20", cal20.getTime());
CDI cdi21 = new CDI("first21", "last21", cal21.getTime());
CDI cdi22 = new CDI("first22", "last22", cal22.getTime());
em.persist(cdi1);
em.persist(cdi2);
em.persist(cdi3);
em.persist(cdi4);
em.persist(cdi5);
em.persist(cdi6);
em.persist(cdi7);
em.persist(cdi8);
em.persist(cdi9);
em.persist(cdi10);
em.persist(cdi11);
em.persist(cdi12);
em.persist(cdi13);
em.persist(cdi14);
em.persist(cdi15);
em.persist(cdi16);
em.persist(cdi17);
em.persist(cdi18);
em.persist(cdi19);
em.persist(cdi20);
em.persist(cdi21);
em.persist(cdi22);
em.getTransaction().commit();
TypedQuery<Long> query = em.createQuery("SELECT count(c) FROM CDI c", Long.class);
Long cdiCount = query.getSingleResult();
assertEquals(22, cdiCount.intValue());
query = em.createQuery("SELECT count(c) FROM CDI c where c.creationDate > {ts '2012-03-29 00:00:00'} and c.creationDate < {ts '2012-03-29 00:59:00'}", Long.class);
cdiCount = query.getSingleResult();
assertEquals(3, cdiCount.intValue());
query = em.createQuery("SELECT count(c) FROM CDI c where c.creationDate > :startdate and c.creationDate < :enddate", Long.class);
Calendar startDate = new GregorianCalendar(2012, Calendar.MARCH, 29, 0, 0);
query.setParameter("startdate", startDate);
Calendar endDate = new GregorianCalendar(2012, Calendar.MARCH, 29, 1, 0);
query.setParameter("enddate", endDate);
cdiCount = query.getSingleResult();
assertEquals(3, cdiCount.intValue());
query = em.createQuery("SELECT count(c) FROM CDI c where c.creationDate > :startdate and c.creationDate < :enddate", Long.class);
startDate = new GregorianCalendar(2012, Calendar.MARCH, 29, 11, 0);
query.setParameter("startdate", startDate);
endDate = new GregorianCalendar(2012, Calendar.MARCH, 29, 12, 00);
query.setParameter("enddate", endDate);
cdiCount = query.getSingleResult();
assertEquals(1, cdiCount.intValue());
TypedQuery<CDI> query2 = em.createQuery("SELECT c FROM CDI c where c.creationDate > {ts '2012-03-29 00:00:00'} and c.creationDate < {ts '2012-03-29 00:08:00'}", CDI.class);
List<CDI> results = query2.getResultList();
assertEquals(1, results.size());
assertEquals("first1", results.get(0).getFirstname());
query2 = em.createQuery("SELECT c FROM CDI c where c.creationDate > {ts '2012-03-29 12:00:00'} and c.creationDate < {ts '2012-03-29 12:08:00'}", CDI.class);
results = query2.getResultList();
assertEquals(1, results.size());
assertEquals("first16", results.get(0).getFirstname());
query = em.createQuery("SELECT count(c) FROM CDI c where c.creationDate > {ts '2012-03-29 11:00:00'} and c.creationDate < {ts '2012-03-29 12:00:00'}", Long.class);
cdiCount = query.getSingleResult();
assertEquals(1, cdiCount.intValue());
em.close();
emf.close();
}
@Entity
@TableGenerator(name="IdTableGen", initialValue=1, allocationSize=50)
public static class CDI implements Serializable{
private static final long serialVersionUID = 1L;
private Date creationDate = null;
private String firstname = null;
private String lastname = null;
private long id;
public CDI() {
}
public CDI(String firstname, String lastname) {
this.firstname = firstname;
this.lastname = lastname;
this.creationDate = new Date();
}
public CDI(String firstname, String lastname, Date creationDate) {
this.firstname = firstname;
this.lastname = lastname;
this.creationDate = creationDate;
}
@Temporal(TemporalType.TIMESTAMP)
public Date getCreationDate() {
return creationDate;
}
public void setCreationDate(Date creationDate) {
this.creationDate = creationDate;
}
@Id
@GeneratedValue(strategy=GenerationType.TABLE, generator="IdTableGen")
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
@Index(unique="false")
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
@Index(unique="false")
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
}
} 
