diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/PartialDate.java b/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/PartialDate.java
index 4163952c1..ea2c2c902 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/PartialDate.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/PartialDate.java
@@ -1,5 +1,7 @@
 package org.navalplanner.business.common.partialtime;
 
+import java.io.Serializable;
+import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Date;
@@ -389,4 +391,16 @@ public class PartialDate implements ReadablePartial {
                     + this.granularity);
         return get(granularity.getMostSpecific());
     }
+
+    public Serializable[] getDataForPersistence() {
+        return new Serializable[] {
+                new Timestamp(normalizedInstant.getMillis()),
+                granularity.name() };
+    }
+
+    public static PartialDate createFromDataForPersistence(Object... values) {
+        Timestamp instant = (Timestamp) values[0];
+        Granularity granularity = Granularity.valueOf((String) values[1]);
+        return PartialDate.createFrom(instant).with(granularity);
+    }
 }
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/hibernate/IntervalOfPartialDatesType.java b/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/hibernate/IntervalOfPartialDatesType.java
new file mode 100644
index 000000000..d91b660e6
--- /dev/null
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/hibernate/IntervalOfPartialDatesType.java
@@ -0,0 +1,135 @@
+package org.navalplanner.business.common.partialtime.hibernate;
+
+import java.io.Serializable;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.Properties;
+
+import org.hibernate.HibernateException;
+import org.hibernate.engine.SessionImplementor;
+import org.hibernate.type.CustomType;
+import org.hibernate.type.Type;
+import org.hibernate.usertype.CompositeUserType;
+import org.navalplanner.business.common.partialtime.IntervalOfPartialDates;
+import org.navalplanner.business.common.partialtime.PartialDate;
+
+public class IntervalOfPartialDatesType implements CompositeUserType {
+
+    private static final String[] PROPERTY_NAMES = { "start", "end" };
+    private final PartialDateType PARTIAL_DATE_TYPE = new PartialDateType();
+
+    @Override
+    public IntervalOfPartialDates assemble(Serializable cached,
+            SessionImplementor session,
+            Object owner) throws HibernateException {
+        Object[] components = (Object[]) cached;
+        PartialDate start = PARTIAL_DATE_TYPE.assemble(
+                (Serializable) components[0], owner);
+        PartialDate end = PARTIAL_DATE_TYPE.assemble(
+                (Serializable) components[1], owner);
+        return new IntervalOfPartialDates(start, end);
+    }
+
+    @Override
+    public Serializable disassemble(Object value, SessionImplementor session)
+            throws HibernateException {
+        IntervalOfPartialDates interval = (IntervalOfPartialDates) value;
+        return new Object[] {
+                PARTIAL_DATE_TYPE.disassemble(interval.getStart()),
+                PARTIAL_DATE_TYPE.disassemble(interval.getEnd()) };
+    }
+
+    @Override
+    public Object deepCopy(Object value) throws HibernateException {
+        return value;
+    }
+
+
+    @Override
+    public boolean equals(Object x, Object y) throws HibernateException {
+        if (x == y)
+            return true;
+        if (x == null || y == null)
+            return false;
+        return x.equals(y);
+    }
+
+    @Override
+    public String[] getPropertyNames() {
+        return PROPERTY_NAMES;
+    }
+
+    @Override
+    public Type[] getPropertyTypes() {
+        Properties emptyProperties = new Properties();
+        CustomType partialDateTypeAsType = new CustomType(
+                PartialDateType.class,
+                emptyProperties);
+        return new Type[] { partialDateTypeAsType, partialDateTypeAsType };
+    }
+
+    @Override
+    public Object getPropertyValue(Object component, int property)
+            throws HibernateException {
+        IntervalOfPartialDates interval = (IntervalOfPartialDates) component;
+        return property == 0 ? interval.getStart() : interval.getEnd();
+    }
+
+    @Override
+    public int hashCode(Object x) throws HibernateException {
+        return x.hashCode();
+    }
+
+    @Override
+    public boolean isMutable() {
+        return false;
+    }
+
+    @Override
+    public Object nullSafeGet(ResultSet rs, String[] names,
+            SessionImplementor session, Object owner)
+            throws HibernateException, SQLException {
+        PartialDate start = PARTIAL_DATE_TYPE.nullSafeGet(rs, subArray(names,
+                0, 2), owner);
+        PartialDate end = PARTIAL_DATE_TYPE.nullSafeGet(rs, subArray(names, 2,
+                2), owner);
+        if (start == null || end == null)
+            return null;
+        return new IntervalOfPartialDates(start, end);
+    }
+
+    private static String[] subArray(String[] array, int initialPosition,
+            int size) {
+        String[] result = new String[size];
+        System.arraycopy(array, initialPosition, result, 0, size);
+        return result;
+    }
+
+    @Override
+    public void nullSafeSet(PreparedStatement st, Object value, int index,
+            SessionImplementor session) throws HibernateException, SQLException {
+        IntervalOfPartialDates interval = (IntervalOfPartialDates) value;
+        PARTIAL_DATE_TYPE.nullSafeSet(st, interval.getStart(), index);
+        PARTIAL_DATE_TYPE.nullSafeSet(st, interval.getEnd(), index + 2);
+    }
+
+    @Override
+    public Object replace(Object original, Object target,
+            SessionImplementor session, Object owner) throws HibernateException {
+        return original;
+    }
+
+    @Override
+    public Class returnedClass() {
+        return IntervalOfPartialDates.class;
+    }
+
+    @Override
+    public void setPropertyValue(Object component, int property, Object value)
+            throws HibernateException {
+        throw new UnsupportedOperationException(
+                "IntervalOfPartialDates is immutable");
+    }
+
+}
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/hibernate/PartialDateType.java b/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/hibernate/PartialDateType.java
new file mode 100644
index 000000000..ae01d818d
--- /dev/null
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/hibernate/PartialDateType.java
@@ -0,0 +1,115 @@
+package org.navalplanner.business.common.partialtime.hibernate;
+
+import java.io.Serializable;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Timestamp;
+import java.sql.Types;
+
+import org.hibernate.Hibernate;
+import org.hibernate.HibernateException;
+import org.hibernate.usertype.UserType;
+import org.navalplanner.business.common.partialtime.PartialDate;
+
+/**
+ * Persists a {@link PartialDate} through hibernate. <br />
+ * @author Óscar González Fernández<ogonzalez@igalia.com>
+ */
+public class PartialDateType implements UserType {
+    // TODO consider the possibility of using an integer for storing the enum
+    private static final int[] SQL_TYPES = { Types.TIMESTAMP, Types.VARCHAR };
+
+    @Override
+    public int[] sqlTypes() {
+        return SQL_TYPES;
+    }
+
+    @Override
+    public Class returnedClass() {
+        return PartialDate.class;
+    }
+
+    public static class CachedRepresentation implements Serializable {
+        private final Serializable[] fields;
+
+        private CachedRepresentation(Serializable[] fields) {
+            this.fields = fields;
+        }
+
+        public PartialDate toOriginal() {
+            return PartialDate.createFromDataForPersistence(fields[0],
+                    fields[1]);
+        }
+    }
+
+    @Override
+    public PartialDate assemble(Serializable cached, Object owner)
+            throws HibernateException {
+        CachedRepresentation representation = (CachedRepresentation) cached;
+        return representation.toOriginal();
+    }
+
+    @Override
+    public Serializable disassemble(Object value) throws HibernateException {
+        PartialDate partialDate = (PartialDate) value;
+        return new CachedRepresentation(partialDate.getDataForPersistence());
+    }
+
+    public Object deepCopy(Object value) throws HibernateException {
+        return value;
+    }
+
+    @Override
+    public boolean equals(Object x, Object y) throws HibernateException {
+        if (x == y)
+            return true;
+        if (x == null || y == null)
+            return false;
+        return x.equals(y);
+    }
+
+    @Override
+    public int hashCode(Object x) throws HibernateException {
+        return x.hashCode();
+    }
+
+    @Override
+    public boolean isMutable() {
+        return false;
+    }
+
+    @Override
+    public PartialDate nullSafeGet(ResultSet rs, String[] names, Object owner)
+            throws HibernateException, SQLException {
+        Timestamp timestamp = (Timestamp) Hibernate.TIMESTAMP.nullSafeGet(rs,
+                names[0]);
+        String granularity = (String) Hibernate.STRING
+                .nullSafeGet(rs, names[1]);
+        if (timestamp == null || granularity == null)
+            return null;
+        return PartialDate.createFromDataForPersistence(timestamp, granularity);
+    }
+
+    @Override
+    public void nullSafeSet(PreparedStatement st, Object value, int index)
+            throws HibernateException, SQLException {
+        Timestamp timeToSet = null;
+        String granularityToSet = null;
+        PartialDate partialDate = (PartialDate) value;
+        if (partialDate != null) {
+            Serializable[] dataForPersistence = partialDate
+                    .getDataForPersistence();
+            timeToSet = (Timestamp) dataForPersistence[0];
+            granularityToSet = (String) dataForPersistence[1];
+        }
+        Hibernate.TIMESTAMP.nullSafeSet(st, timeToSet, index);
+        Hibernate.STRING.nullSafeSet(st, granularityToSet, index + 1);
+    }
+
+    @Override
+    public Object replace(Object original, Object target, Object owner)
+            throws HibernateException {
+        return original;
+    }
+}
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/hibernate/TimeQuantityType.java b/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/hibernate/TimeQuantityType.java
new file mode 100644
index 000000000..0fa7903a8
--- /dev/null
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/common/partialtime/hibernate/TimeQuantityType.java
@@ -0,0 +1,111 @@
+package org.navalplanner.business.common.partialtime.hibernate;
+
+import java.io.Serializable;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Types;
+import java.util.Iterator;
+
+import net.sf.json.JSONObject;
+
+import org.hibernate.Hibernate;
+import org.hibernate.HibernateException;
+import org.hibernate.usertype.UserType;
+import org.navalplanner.business.common.partialtime.TimeQuantity;
+import org.navalplanner.business.common.partialtime.PartialDate.Granularity;
+
+public class TimeQuantityType implements UserType {
+
+    private static final int[] SQL_TYPES = { Types.VARCHAR };
+
+    @Override
+    public int[] sqlTypes() {
+        return SQL_TYPES;
+    }
+
+    private static String asString(TimeQuantity timeQuantity) {
+        JSONObject jsonObject = new JSONObject();
+        for (Granularity granularity : Granularity.values()) {
+            Integer value = timeQuantity.valueFor(granularity);
+            if (value != 0)
+                jsonObject.put(granularity.name(), value);
+        }
+        return jsonObject.toString();
+    }
+
+    private static TimeQuantity fromString(String timeQuantityAsString) {
+        JSONObject jsonObject = JSONObject.fromObject(timeQuantityAsString);
+        Iterator keys = jsonObject.keys();
+        TimeQuantity result = TimeQuantity.empty();
+        while(keys.hasNext()){
+            Object key = keys.next();
+            Object object = jsonObject.get(key);
+            result = result.plus((Integer) object, Granularity
+                    .valueOf((String) key));
+        }
+        return result;
+    }
+
+    @Override
+    public Object assemble(Serializable cached, Object owner)
+            throws HibernateException {
+        return fromString((String) cached);
+    }
+
+    @Override
+    public Serializable disassemble(Object value) throws HibernateException {
+        return asString((TimeQuantity) value);
+    }
+
+    @Override
+    public Object deepCopy(Object value) throws HibernateException {
+        return value;
+    }
+
+
+    @Override
+    public boolean equals(Object x, Object y) throws HibernateException {
+        if (x == y)
+            return true;
+        if (x == null || y == null)
+            return false;
+        return x.equals(y);
+    }
+
+    @Override
+    public int hashCode(Object x) throws HibernateException {
+        return x.hashCode();
+    }
+
+    @Override
+    public boolean isMutable() {
+        return false;
+    }
+
+    @Override
+    public Object nullSafeGet(ResultSet rs, String[] names, Object owner)
+            throws HibernateException, SQLException {
+        String timeQuantityAsString = (String) Hibernate.STRING.nullSafeGet(rs,
+                names);
+        return fromString(timeQuantityAsString);
+    }
+
+    @Override
+    public void nullSafeSet(PreparedStatement st, Object value, int index)
+            throws HibernateException, SQLException {
+        Hibernate.STRING.nullSafeSet(st, asString((TimeQuantity) value), index);
+    }
+
+    @Override
+    public Object replace(Object original, Object target, Object owner)
+            throws HibernateException {
+        return original;
+    }
+
+    @Override
+    public Class returnedClass() {
+        return TimeQuantity.class;
+    }
+
+}
diff --git a/navalplanner-business/src/test/java/org/navalplanner/business/common/test/partialtime/EntityContainingIntervalOfPartialDates.java b/navalplanner-business/src/test/java/org/navalplanner/business/common/test/partialtime/EntityContainingIntervalOfPartialDates.java
new file mode 100644
index 000000000..41d9f7609
--- /dev/null
+++ b/navalplanner-business/src/test/java/org/navalplanner/business/common/test/partialtime/EntityContainingIntervalOfPartialDates.java
@@ -0,0 +1,37 @@
+package org.navalplanner.business.common.test.partialtime;
+
+import org.navalplanner.business.common.partialtime.IntervalOfPartialDates;
+
+public class EntityContainingIntervalOfPartialDates {
+
+    private Long id;
+
+    private Long version;
+
+    private IntervalOfPartialDates interval;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getVersion() {
+        return version;
+    }
+
+    public void setVersion(Long version) {
+        this.version = version;
+    }
+
+    public IntervalOfPartialDates getInterval() {
+        return interval;
+    }
+
+    public void setInterval(IntervalOfPartialDates interval) {
+        this.interval = interval;
+    }
+
+}
diff --git a/navalplanner-business/src/test/java/org/navalplanner/business/common/test/partialtime/EntityContainingPartialDate.java b/navalplanner-business/src/test/java/org/navalplanner/business/common/test/partialtime/EntityContainingPartialDate.java
new file mode 100644
index 000000000..22b6b57f6
--- /dev/null
+++ b/navalplanner-business/src/test/java/org/navalplanner/business/common/test/partialtime/EntityContainingPartialDate.java
@@ -0,0 +1,38 @@
+package org.navalplanner.business.common.test.partialtime;
+
+import org.navalplanner.business.common.partialtime.PartialDate;
+
+public class EntityContainingPartialDate {
+
+    private Long id;
+
+    private Long version;
+
+    private PartialDate partialDate;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getVersion() {
+        return version;
+    }
+
+    public void setVersion(Long version) {
+        this.version = version;
+    }
+
+    public PartialDate getPartialDate() {
+        return partialDate;
+    }
+
+    public void setPartialDate(PartialDate partialDate) {
+        this.partialDate = partialDate;
+    }
+
+
+}
diff --git a/navalplanner-business/src/test/java/org/navalplanner/business/common/test/partialtime/EntityContainingTimeQuantity.java b/navalplanner-business/src/test/java/org/navalplanner/business/common/test/partialtime/EntityContainingTimeQuantity.java
new file mode 100644
index 000000000..9c0a190b6
--- /dev/null
+++ b/navalplanner-business/src/test/java/org/navalplanner/business/common/test/partialtime/EntityContainingTimeQuantity.java
@@ -0,0 +1,37 @@
+package org.navalplanner.business.common.test.partialtime;
+
+import org.navalplanner.business.common.partialtime.TimeQuantity;
+
+public class EntityContainingTimeQuantity {
+
+    private Long id;
+
+    private Long version;
+
+    private TimeQuantity timeQuantity;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getVersion() {
+        return version;
+    }
+
+    public void setVersion(Long version) {
+        this.version = version;
+    }
+
+    public TimeQuantity getTimeQuantity() {
+        return timeQuantity;
+    }
+
+    public void setTimeQuantity(TimeQuantity timeQuantity) {
+        this.timeQuantity = timeQuantity;
+    }
+
+}
diff --git a/navalplanner-business/src/test/java/org/navalplanner/business/common/test/partialtime/PartialDateRelatedClassesHibernateMappingTest.java b/navalplanner-business/src/test/java/org/navalplanner/business/common/test/partialtime/PartialDateRelatedClassesHibernateMappingTest.java
new file mode 100644
index 000000000..0f05a35ca
--- /dev/null
+++ b/navalplanner-business/src/test/java/org/navalplanner/business/common/test/partialtime/PartialDateRelatedClassesHibernateMappingTest.java
@@ -0,0 +1,79 @@
+package org.navalplanner.business.common.test.partialtime;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.junit.Assert.assertThat;
+import static org.navalplanner.business.BusinessGlobalNames.BUSINESS_SPRING_CONFIG_FILE;
+import static org.navalplanner.business.test.BusinessGlobalNames.BUSINESS_SPRING_CONFIG_TEST_FILE;
+
+import org.hibernate.Session;
+import org.hibernate.SessionFactory;
+import org.joda.time.LocalDate;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.navalplanner.business.common.partialtime.IntervalOfPartialDates;
+import org.navalplanner.business.common.partialtime.PartialDate;
+import org.navalplanner.business.common.partialtime.TimeQuantity;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.transaction.annotation.Transactional;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(locations = { BUSINESS_SPRING_CONFIG_FILE,
+        BUSINESS_SPRING_CONFIG_TEST_FILE })
+@Transactional
+public class PartialDateRelatedClassesHibernateMappingTest {
+
+    @Autowired
+    private SessionFactory sessionFactory;
+
+    public Session getSession() {
+        return sessionFactory.getCurrentSession();
+    }
+
+    @Test
+    public void partialDatesCanBeSavedAndRetrieved() {
+        EntityContainingPartialDate entity = new EntityContainingPartialDate();
+        PartialDate partialDate = PartialDate.createFrom(new LocalDate(2000, 4,
+                20));
+        entity.setPartialDate(partialDate);
+        getSession().save(entity);
+        getSession().flush();
+        getSession().evict(entity);
+        EntityContainingPartialDate reloaded = (EntityContainingPartialDate) getSession()
+                .get(EntityContainingPartialDate.class, entity.getId());
+        assertThat(reloaded.getPartialDate(), equalTo(partialDate));
+    }
+
+    @Test
+    public void intervalsCanBeSavedAndRetrieved() {
+        EntityContainingIntervalOfPartialDates entity = new EntityContainingIntervalOfPartialDates();
+        PartialDate start = PartialDate.createFrom(new LocalDate(2000, 4, 20));
+        PartialDate end = PartialDate.createFrom(new LocalDate(2001, 4, 23));
+        IntervalOfPartialDates original = new IntervalOfPartialDates(start, end);
+        entity.setInterval(original);
+        getSession().save(entity);
+        getSession().flush();
+        getSession().evict(entity);
+        EntityContainingIntervalOfPartialDates reloaded = (EntityContainingIntervalOfPartialDates) getSession()
+                .get(
+                EntityContainingIntervalOfPartialDates.class, entity.getId());
+        assertThat(reloaded.getInterval(), equalTo(original));
+    }
+
+    @Test
+    public void timeQuantitysCanBeSavedAndRetrieved() {
+        EntityContainingTimeQuantity entity = new EntityContainingTimeQuantity();
+        TimeQuantity duration = new IntervalOfPartialDates(PartialDate.createFrom(new LocalDate(2000, 4, 20)), PartialDate.createFrom(new LocalDate(2001, 4, 23)))
+                .getDuration();
+        entity.setTimeQuantity(duration);
+        getSession().save(entity);
+        getSession().flush();
+        getSession().evict(entity);
+        EntityContainingTimeQuantity reloaded = (EntityContainingTimeQuantity) getSession()
+                .get(
+                EntityContainingTimeQuantity.class, entity.getId());
+        TimeQuantity timeQuantity = reloaded.getTimeQuantity();
+        assertThat(timeQuantity, equalTo(duration));
+    }
+}
diff --git a/navalplanner-business/src/test/resources/TestEntities.hbm.xml b/navalplanner-business/src/test/resources/TestEntities.hbm.xml
new file mode 100644
index 000000000..d33117824
--- /dev/null
+++ b/navalplanner-business/src/test/resources/TestEntities.hbm.xml
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
+<hibernate-mapping default-access="field">
+  <class name="org.navalplanner.business.common.test.partialtime.EntityContainingPartialDate">
+    <id name="id">
+      <generator class="native"/>
+    </id>
+    <version name="version" type="long"/>
+    <property name="partialDate" type="org.navalplanner.business.common.partialtime.hibernate.PartialDateType">
+        <column name="normalizedInstant"></column>
+        <column name="granularity"></column>
+    </property>
+  </class>
+  <class name="org.navalplanner.business.common.test.partialtime.EntityContainingIntervalOfPartialDates">
+      <id name="id">
+      <generator class="native"/>
+    </id>
+    <version name="version" type="long"/>
+    <property name="interval" type="org.navalplanner.business.common.partialtime.hibernate.IntervalOfPartialDatesType">
+        <column name="start_instant"></column>
+        <column name="start_granularity"></column>
+        <column name="end_instant"></column>
+        <column name="end_granularity"></column>
+    </property>
+  </class>
+  <class name="org.navalplanner.business.common.test.partialtime.EntityContainingTimeQuantity">
+      <id name="id">
+      <generator class="native"/>
+    </id>
+    <version name="version" type="long"/>
+    <property name="timeQuantity" type="org.navalplanner.business.common.partialtime.hibernate.TimeQuantityType"></property>
+  </class>
+</hibernate-mapping>
diff --git a/navalplanner-business/src/test/resources/navalplanner-business-spring-config-test.xml b/navalplanner-business/src/test/resources/navalplanner-business-spring-config-test.xml
index 78946c8fd..be89b5f59 100644
--- a/navalplanner-business/src/test/resources/navalplanner-business-spring-config-test.xml
+++ b/navalplanner-business/src/test/resources/navalplanner-business-spring-config-test.xml
@@ -32,6 +32,9 @@
                 <value>
                     org/navalplanner/business/orders/entities/Orders.hbm.xml
                 </value>
+                 <value>
+                    TestEntities.hbm.xml
+                </value>
             </list>
         </property>