diff --git a/Gopkg.lock b/Gopkg.lock
index 4ce0c74..685e39e 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -2,7 +2,8 @@
 
 
 [[projects]]
-  digest = "1:8f6002b9f5b58e8b0a908ff932100fe232f8259f782400556bdd997c4d53bca1"
+  branch = "master"
+  digest = "1:8f5ac811829608c7b2f41a0556ec269660e0490a7e8a2e1e6d30e873f61f5cea"
   name = "github.com/cloudtrust/common-service"
   packages = [
     ".",
@@ -10,8 +11,7 @@
     "log",
   ]
   pruneopts = ""
-  revision = "6f43146697b189b011f98619ca2674c29d769ea0"
-  version = "v2.0.1"
+  revision = "f4ba60b596a01823f15277487cc046ca0faab79e"
 
 [[projects]]
   digest = "1:bb7f91ab4d1c44a3bb2651c613463c134165bda0282fca891a63b88d1b501997"
diff --git a/Gopkg.toml b/Gopkg.toml
index ad7d639..c6e8c4f 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -22,7 +22,7 @@
 
 [[constraint]]
   name = "github.com/cloudtrust/common-service"
-  version = "v2.0.1"
+  branch = "master"
 
 [[constraint]]
   name = "github.com/pkg/errors"
diff --git a/definitions.go b/definitions.go
index 9867743..4d8f8df 100644
--- a/definitions.go
+++ b/definitions.go
@@ -675,10 +675,16 @@ type UserFederationProviderRepresentation struct {
 	ProviderName      *string                 `json:"providerName,omitempty"`
 }
 
+// AttributeKey type
+type AttributeKey string
+
+// Attributes type
+type Attributes map[AttributeKey][]string
+
 // UserRepresentation struct
 type UserRepresentation struct {
 	Access                     *map[string]bool                   `json:"access,omitempty"`
-	Attributes                 *map[string][]string               `json:"attributes,omitempty"`
+	Attributes                 *Attributes                        `json:"attributes,omitempty"`
 	ClientConsents             *[]UserConsentRepresentation       `json:"clientConsents,omitempty"`
 	ClientRoles                *map[string][]string               `json:"clientRoles,omitempty"`
 	CreatedTimestamp           *int64                             `json:"createdTimestamp,omitempty"`
diff --git a/model_toolbox.go b/model_toolbox.go
new file mode 100644
index 0000000..861e5f4
--- /dev/null
+++ b/model_toolbox.go
@@ -0,0 +1,242 @@
+package keycloak
+
+import (
+	"strconv"
+	"time"
+)
+
+// Get a given attribute
+func (a Attributes) Get(key AttributeKey) []string {
+	return a[key]
+}
+
+// Set a given attribute
+func (a Attributes) Set(key AttributeKey, value []string) {
+	a[key] = value
+}
+
+// GetString gets the first value of a given attribute
+func (a Attributes) GetString(key AttributeKey) *string {
+	var attrbs = a[key]
+	if len(attrbs) > 0 {
+		return &attrbs[0]
+	}
+	return nil
+}
+
+// SetString sets the value of a given attribute
+func (a Attributes) SetString(key AttributeKey, value string) {
+	a.Set(key, []string{value})
+}
+
+// GetInt gets the first value of a given attribute
+func (a Attributes) GetInt(key AttributeKey) (*int, error) {
+	var attrbs = a[key]
+	if len(attrbs) > 0 {
+		var res64, err = strconv.ParseInt(attrbs[0], 0, 0)
+		var res = int(res64)
+		return &res, err
+	}
+	return nil, nil
+}
+
+// SetInt sets the value of a given attribute
+func (a Attributes) SetInt(key AttributeKey, value int) {
+	a.Set(key, []string{strconv.FormatInt(int64(value), 10)})
+}
+
+// GetBool gets the first value of a given attribute
+func (a Attributes) GetBool(key AttributeKey) (*bool, error) {
+	var attrbs = a[key]
+	if len(attrbs) > 0 {
+		var res, err = strconv.ParseBool(attrbs[0])
+		return &res, err
+	}
+	return nil, nil
+}
+
+// SetBool sets the value of a given attribute
+func (a Attributes) SetBool(key AttributeKey, value bool) {
+	a.Set(key, []string{strconv.FormatBool(value)})
+}
+
+// GetDate returns an attribute which contains a date value
+func (a Attributes) GetDate(key AttributeKey, dateLayouts []string) *string {
+	var attrb = a.GetString(key)
+	var formatted = a.reformatDate(attrb, dateLayouts)
+	if formatted != nil {
+		a[key] = []string{*formatted}
+		return formatted
+	}
+	return attrb
+}
+
+// SetDate sets a date
+func (a Attributes) SetDate(key AttributeKey, value string, dateLayouts []string) {
+	var formatted = a.reformatDate(&value, dateLayouts)
+	if formatted != nil {
+		value = *formatted
+	}
+	a.Set(key, []string{value})
+}
+
+// GetTime returns an attribute which contains a date value
+func (a Attributes) GetTime(key AttributeKey, dateLayouts []string) (*time.Time, error) {
+	return a.parseDate(a.GetString(key), dateLayouts)
+}
+
+// SetTime sets a date
+func (a Attributes) SetTime(key AttributeKey, value time.Time, dateLayout string) {
+	a.Set(key, []string{value.Format(dateLayout)})
+}
+
+// SetStringWhenNotNil sets an attribute value if it is not nil
+func (a Attributes) SetStringWhenNotNil(key AttributeKey, value *string) {
+	if value != nil {
+		a.Set(key, []string{*value})
+	}
+}
+
+// SetIntWhenNotNil sets an attribute value if it is not nil
+func (a Attributes) SetIntWhenNotNil(key AttributeKey, value *int) {
+	if value != nil {
+		a.Set(key, []string{strconv.FormatInt(int64(*value), 10)})
+	}
+}
+
+// SetBoolWhenNotNil sets an attribute value if it is not nil
+func (a Attributes) SetBoolWhenNotNil(key AttributeKey, value *bool) {
+	if value != nil {
+		a.Set(key, []string{strconv.FormatBool(*value)})
+	}
+}
+
+// SetDateWhenNotNil sets a date attribute if it is not nil
+func (a Attributes) SetDateWhenNotNil(key AttributeKey, value *string, dateLayouts []string) {
+	if value != nil {
+		a.SetDate(key, *value, dateLayouts)
+	}
+}
+
+// SetTimeWhenNotNil sets a date attribute if it is not nil
+func (a Attributes) SetTimeWhenNotNil(key AttributeKey, value *time.Time, dateLayout string) {
+	if value != nil {
+		a.SetTime(key, *value, dateLayout)
+	}
+}
+
+func (a Attributes) parseDate(value *string, dateLayouts []string) (*time.Time, error) {
+	if value == nil || len(dateLayouts) == 0 {
+		return nil, nil
+	}
+	var date, firstErr = time.Parse(dateLayouts[0], *value)
+	if firstErr == nil {
+		return &date, nil
+	}
+
+	// Date does not have the expected layout. Try to convert it from supported layouts
+	var err error
+	for _, layout := range dateLayouts[1:] {
+		date, err = time.Parse(layout, *value)
+		if err == nil {
+			return &date, nil
+		}
+	}
+
+	return nil, firstErr
+}
+
+func (a Attributes) reformatDate(value *string, dateLayouts []string) *string {
+	var date, err = a.parseDate(value, dateLayouts)
+	if err != nil || date == nil {
+		return nil
+	}
+	var res = date.Format(dateLayouts[0])
+	return &res
+}
+
+// GetAttribute returns an attribute given its key
+func (u *UserRepresentation) GetAttribute(key AttributeKey) []string {
+	if u.Attributes != nil {
+		return u.Attributes.Get(key)
+	}
+	return nil
+}
+
+// SetAttribute sets an attribute
+func (u *UserRepresentation) SetAttribute(key AttributeKey, value []string) {
+	if u.Attributes == nil {
+		var attrbs = make(Attributes)
+		u.Attributes = &attrbs
+	}
+	u.Attributes.Set(key, value)
+}
+
+// GetAttributeString returns the first value of an attribute given its key
+func (u *UserRepresentation) GetAttributeString(key AttributeKey) *string {
+	if u.Attributes != nil {
+		return u.Attributes.GetString(key)
+	}
+	return nil
+}
+
+// SetAttributeString sets an attribute with a single value
+func (u *UserRepresentation) SetAttributeString(key AttributeKey, value string) {
+	u.SetAttribute(key, []string{value})
+}
+
+// GetAttributeBool returns the first value of an attribute given its key
+func (u *UserRepresentation) GetAttributeBool(key AttributeKey) (*bool, error) {
+	if u.Attributes != nil {
+		return u.Attributes.GetBool(key)
+	}
+	return nil, nil
+}
+
+// SetAttributeBool sets an attribute with a single value
+func (u *UserRepresentation) SetAttributeBool(key AttributeKey, value bool) {
+	u.SetAttribute(key, []string{strconv.FormatBool(value)})
+}
+
+// GetAttributeInt returns the first value of an attribute given its key
+func (u *UserRepresentation) GetAttributeInt(key AttributeKey) (*int, error) {
+	if u.Attributes != nil {
+		return u.Attributes.GetInt(key)
+	}
+	return nil, nil
+}
+
+// SetAttributeInt sets an attribute with a single value
+func (u *UserRepresentation) SetAttributeInt(key AttributeKey, value int) {
+	u.SetAttribute(key, []string{strconv.FormatInt(int64(value), 10)})
+}
+
+// GetAttributeDate returns an attribute which contains a date value
+func (u *UserRepresentation) GetAttributeDate(key AttributeKey, dateLayouts []string) *string {
+	if u.Attributes != nil {
+		return u.Attributes.GetDate(key, dateLayouts)
+	}
+	return nil
+}
+
+// SetAttributeDate sets a date attribute
+func (u *UserRepresentation) SetAttributeDate(key AttributeKey, date string, dateLayouts []string) {
+	if u.Attributes == nil {
+		var attrbs = make(Attributes)
+		u.Attributes = &attrbs
+	}
+	u.Attributes.SetDate(key, date, dateLayouts)
+}
+
+// GetAttributeTime returns an attribute which contains a date value
+func (u *UserRepresentation) GetAttributeTime(key AttributeKey, dateLayouts []string) (*time.Time, error) {
+	if u.Attributes != nil {
+		return u.Attributes.GetTime(key, dateLayouts)
+	}
+	return nil, nil
+}
+
+// SetAttributeTime sets a date attribute
+func (u *UserRepresentation) SetAttributeTime(key AttributeKey, date time.Time, dateLayout string) {
+	u.SetAttributeString(key, date.Format(dateLayout))
+}
diff --git a/model_toolbox_test.go b/model_toolbox_test.go
new file mode 100644
index 0000000..fb5dadf
--- /dev/null
+++ b/model_toolbox_test.go
@@ -0,0 +1,104 @@
+package keycloak
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var (
+	supportedDateLayouts = []string{"02.01.2006", "2006/01/02"}
+)
+
+func TestUserRepresentationAttributes(t *testing.T) {
+	var userRep UserRepresentation
+
+	var (
+		keyMissing  = AttributeKey("missing")
+		keyDate     = AttributeKey("date")
+		keyGender   = AttributeKey("gender")
+		keyMultiple = AttributeKey("multiple")
+	)
+
+	// Attributes are empty
+	assert.Nil(t, userRep.GetAttribute(keyMissing), "Search with no attribute")
+	assert.Nil(t, userRep.GetAttributeString(keyMissing), "Search with no attribute")
+	assert.Nil(t, userRep.GetAttributeDate(keyDate, supportedDateLayouts), "Search with no attribute")
+
+	// Sets some attributes
+	userRep.SetAttributeString(keyDate, "2021/12/31")
+	userRep.SetAttributeString(keyGender, "M")
+
+	// Search for a missing attribute
+	assert.Nil(t, userRep.GetAttribute(keyMissing), "Missing attribute")
+
+	t.Run("Check that a Set/Get cycle gives the correct values", func(t *testing.T) {
+		userRep.SetAttribute(AttributeKey("multiple"), []string{"3", "7", "21"})
+		assert.Equal(t, []string{"3", "7", "21"}, userRep.GetAttribute(keyMultiple), "Gets a multiple-value attribute")
+		assert.Equal(t, []string{"2021/12/31"}, userRep.GetAttribute(keyDate), "Gets an array")
+		assert.Equal(t, "2021/12/31", *userRep.GetAttributeString(keyDate), "Gets a single attribute")
+		assert.Equal(t, "31.12.2021", *userRep.GetAttributeDate(keyDate, supportedDateLayouts), "Gets a birthdate")
+	})
+
+	t.Run("Attributes and dates", func(t *testing.T) {
+		// Set a date in a different format than the one which will be used to store the information
+		userRep.SetAttributeDate(keyDate, "2021/12/31", supportedDateLayouts)
+		assert.Equal(t, "31.12.2021", *userRep.GetAttributeString(keyDate), "Gets a single attribute")
+		assert.Equal(t, "31.12.2021", *userRep.GetAttributeDate(keyDate, supportedDateLayouts), "Gets a birthdate")
+
+		// Do not override a parameter with a nil value
+		userRep.Attributes.SetDateWhenNotNil(keyDate, nil, supportedDateLayouts)
+		assert.Equal(t, "31.12.2021", *userRep.GetAttributeString(keyDate))
+		var otherDate = "30.11.2022"
+		userRep.Attributes.SetDateWhenNotNil(keyDate, &otherDate, supportedDateLayouts)
+		assert.Equal(t, otherDate, *userRep.GetAttributeString(keyDate))
+	})
+
+	t.Run("Int tests", func(t *testing.T) {
+		var keyInt = AttributeKey("numeric")
+		var res, err = userRep.Attributes.GetInt(keyInt)
+		var value = 5
+		assert.Nil(t, err)
+		assert.Nil(t, res)
+		// Set int value
+		userRep.Attributes.SetIntWhenNotNil(keyInt, &value)
+		res, err = userRep.Attributes.GetInt(keyInt)
+		assert.Nil(t, err)
+		assert.Equal(t, value, *res)
+		// Set when not nil : won't have any effect with nil
+		userRep.Attributes.SetIntWhenNotNil(keyInt, nil)
+		res, err = userRep.Attributes.GetInt(keyInt)
+		assert.Nil(t, err)
+		assert.Equal(t, value, *res)
+		// Update to 10
+		value = 10
+		userRep.Attributes.SetIntWhenNotNil(keyInt, &value)
+		res, err = userRep.Attributes.GetInt(keyInt)
+		assert.Nil(t, err)
+		assert.Equal(t, value, *res)
+	})
+
+	t.Run("Boolean tests", func(t *testing.T) {
+		var keyBool = AttributeKey("boolean")
+		var res, err = userRep.Attributes.GetBool(keyBool)
+		var value = false
+		assert.Nil(t, err)
+		assert.Nil(t, res)
+		// Set boolean value
+		userRep.Attributes.SetBoolWhenNotNil(keyBool, &value)
+		res, err = userRep.Attributes.GetBool(keyBool)
+		assert.Nil(t, err)
+		assert.False(t, *res)
+		// Set when not nil : won't have any effect with nil
+		userRep.Attributes.SetBoolWhenNotNil(keyBool, nil)
+		res, err = userRep.Attributes.GetBool(keyBool)
+		assert.Nil(t, err)
+		assert.False(t, *res)
+		// Update to true
+		value = true
+		userRep.Attributes.SetBoolWhenNotNil(keyBool, &value)
+		res, err = userRep.Attributes.GetBool(keyBool)
+		assert.Nil(t, err)
+		assert.True(t, *res)
+	})
+}