diff --git a/app/main.go b/app/main.go
index 8d2834e..4e6d4b4 100644
--- a/app/main.go
+++ b/app/main.go
@@ -10,6 +10,7 @@ import (
 	"repo-pattern/app/repository/smartfilter"
 	"time"
 
+	"github.com/google/uuid"
 	"gorm.io/gorm"
 )
 
@@ -19,14 +20,15 @@ var (
 )
 
 type CertFilter struct {
-	Alive                *bool      `filterfield:"field=alive,operator=EQ"`
-	SerialNumber         *string    `filterfield:"field=serial_number,operator=NE"`
-	SerialNumberContains *string    `filterfield:"field=serial_number,operator=LIKE"`
-	IssuerContains       *string    `filterfield:"field=issuer,operator=ILIKE"`
-	Id                   *string    `filterfield:"field=id,operator=EQ"`
-	Ids                  *[]string  `filterfield:"field=id,operator=IN"`
-	IdsNot               *[]string  `filterfield:"field=id,operator=NOT_IN"`
-	CreatedAt_Lt         *time.Time `filterfield:"field=created_at,operator=LT"`
+	Alive                *bool        `filterfield:"field=alive,operator=EQ"`
+	SerialNumber         *string      `filterfield:"field=serial_number,operator=NE"`
+	SerialNumberContains *string      `filterfield:"field=serial_number,operator=LIKE"`
+	IssuerContains       *string      `filterfield:"field=issuer,operator=ILIKE"`
+	Id                   *uuid.UUID   `filterfield:"field=id,operator=EQ"`
+	Ids                  *[]uuid.UUID `filterfield:"field=id,operator=IN"`
+	IdsNot               *[]string    `filterfield:"field=id,operator=NOT_IN"`
+	CreatedAt_Lt         *time.Time   `filterfield:"field=created_at,operator=LT"`
+	Timestamps           *[]time.Time `filterfield:"field=created_at,operator=IN"`
 }
 
 func doMagic(db *gorm.DB) {
@@ -37,9 +39,14 @@ func doMagic(db *gorm.DB) {
 	// serialNumber := "222"
 	// serialNumberContains := "323"
 	// issuer := "FINA"
-	// location, _ := time.LoadLocation("UTC")
-	// createdTime := time.Date(2024, 5, 26, 16, 8, 0, 0, location)
-	ids := []string{"eb2bcac6-5173-4dbb-93b7-e7c03b924a03", "db9fb837-3483-4736-819d-f427dc8cda23", "1fece5e7-8e8d-4828-8298-3b1f07fd29ff"}
+	location, _ := time.LoadLocation("UTC")
+	createdTime := time.Date(2024, 5, 26, 16, 8, 0, 0, location)
+
+	id1, _ := uuid.Parse("eb2bcac6-5173-4dbb-93b7-e7c03b924a03")
+	id2, _ := uuid.Parse("db9fb837-3483-4736-819d-f427dc8cda23")
+	id3, _ := uuid.Parse("1fece5e7-8e8d-4828-8298-3b1f07fd29ff")
+
+	ids := []uuid.UUID{id1, id2, id3}
 
 	filter := CertFilter{
 		// Alive: &FALSE,
@@ -48,7 +55,7 @@ func doMagic(db *gorm.DB) {
 		// SerialNumberContains: &serialNumberContains,
 		Ids: &ids,
 		// IssuerContains: &issuer,
-		// CreatedAt_Lt:   &createdTime,
+		CreatedAt_Lt: &createdTime,
 	}
 
 	query, err = smartfilter.ToQuery(models.Cert{}, filter, query)
@@ -86,7 +93,7 @@ func doGet(db *gorm.DB) {
 	repo := repository.RepoBase[models.Cert]{}
 	repo.Init(db)
 
-	id := "db9fb837-3483-4736-819d-f427dc8cda23"
+	id, _ := uuid.Parse("db9fb837-3483-4736-819d-f427dc8cda23")
 
 	filter := CertFilter{
 		Id: &id,
@@ -103,7 +110,7 @@ func doExists(db *gorm.DB) {
 	repo := repository.RepoBase[models.Cert]{}
 	repo.Init(db)
 
-	id := "db9fb837-3483-4736-819d-f427dc8cda23"
+	id, _ := uuid.Parse("db9fb837-3483-4736-819d-f427dc8cda23")
 
 	filter := CertFilter{
 		Id: &id,
diff --git a/app/repository/repository_test.go b/app/repository/repository_test.go
index 690640f..0812be3 100644
--- a/app/repository/repository_test.go
+++ b/app/repository/repository_test.go
@@ -8,6 +8,7 @@ import (
 	"testing"
 
 	"github.com/DATA-DOG/go-sqlmock"
+	"github.com/google/uuid"
 	"github.com/stretchr/testify/assert"
 	"gorm.io/driver/postgres"
 	"gorm.io/gorm"
@@ -32,7 +33,7 @@ func NewMockDB() (*sql.DB, *gorm.DB, sqlmock.Sqlmock) {
 }
 
 type MyModel struct {
-	Id    int
+	Id    uuid.UUID
 	Value string
 	Count int
 }
@@ -42,9 +43,9 @@ func (m MyModel) TableName() string {
 }
 
 type MyModelFilter struct {
-	Id    *int    `filterfield:"field=id,operator=EQ"`
-	Value *string `filterfield:"field=value,operator=EQ"`
-	Count *int    `filterfield:"field=count,operator=GT"`
+	Id    *uuid.UUID `filterfield:"field=id,operator=EQ"`
+	Value *string    `filterfield:"field=value,operator=EQ"`
+	Count *int       `filterfield:"field=count,operator=GT"`
 }
 
 func TestListMethod(t *testing.T) {
@@ -166,7 +167,7 @@ func TestListMethod(t *testing.T) {
 		repo := RepoBase[MyModel]{}
 		repo.Init(db)
 
-		id := 123
+		id := uuid.New()
 		filter := MyModelFilter{
 			Id: &id,
 		}
@@ -190,7 +191,7 @@ func TestListMethod(t *testing.T) {
 		repo := RepoBase[MyModel]{}
 		repo.Init(db)
 
-		id := 123
+		id := uuid.New()
 		count := 456
 		value := "some value"
 		filter := MyModelFilter{
@@ -218,7 +219,7 @@ func TestListMethod(t *testing.T) {
 		repo := RepoBase[MyModel]{}
 		repo.Init(db)
 
-		id := 123
+		id := uuid.New()
 		count := 456
 		value := "some value"
 		filter := MyModelFilter{
diff --git a/app/repository/smartfilter/filterfield.go b/app/repository/smartfilter/filterfield.go
index 1593cdc..a4cf4b8 100644
--- a/app/repository/smartfilter/filterfield.go
+++ b/app/repository/smartfilter/filterfield.go
@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"reflect"
 	"time"
+
+	"github.com/google/uuid"
 )
 
 type FilterField struct {
@@ -131,17 +133,41 @@ func strValueGetter(ff *FilterField, v reflect.Value) error {
 }
 
 func timeValueGetter(ff *FilterField, v reflect.Value) error {
-	timeValue, ok := v.Interface().(time.Time)
-	if !ok {
-		return fmt.Errorf("error converting interface to time")
+	value, err := timeValueToStr(v)
+	if err != nil {
+		return err
 	}
-	value := timeValue.Format(time.RFC3339)
-
 	ff.strValue = &value
 	ff.valueKind = reflect.String
 	return nil
 }
 
+func uuidValueGetter(ff *FilterField, v reflect.Value) error {
+	value, err := uuidValueToStr(v)
+	if err != nil {
+		return err
+	}
+	ff.strValue = &value
+	ff.valueKind = reflect.String
+	return nil
+}
+
+func timeValueToStr(v reflect.Value) (string, error) {
+	value, ok := v.Interface().(time.Time)
+	if !ok {
+		return "", fmt.Errorf("error converting interface to time")
+	}
+	return value.Format(time.RFC3339), nil
+}
+
+func uuidValueToStr(v reflect.Value) (string, error) {
+	value, ok := v.Interface().(uuid.UUID)
+	if !ok {
+		return "", fmt.Errorf("error converting interface to uuid")
+	}
+	return value.String(), nil
+}
+
 func unsupportedValueGetter(ff *FilterField, v reflect.Value) error {
 	return fmt.Errorf("unsupported type: %v", v.Type())
 }
@@ -183,16 +209,18 @@ func newTypeGetter(t reflect.Type, allowAddr bool) valueGetterFunc {
 	// 	return interfaceEncoder
 	case reflect.Struct:
 		// check if value type is time
-		timeType := reflect.TypeOf(time.Time{})
-		if t == timeType {
+		if t == reflect.TypeOf(time.Time{}) {
 			return timeValueGetter
 		}
 	// case reflect.Map:
 	// 	return newMapEncoder(t)
 	case reflect.Slice:
 		return newSliceGetter(t)
-	// case reflect.Array:
-	// 	return newArrayGetter(t)
+	case reflect.Array:
+		if t == reflect.TypeOf(uuid.UUID{}) {
+			return uuidValueGetter
+		}
+		return newArrayGetter(t)
 	case reflect.Pointer:
 		return newPtrValueGetter(t)
 	}
@@ -246,6 +274,22 @@ func (sg sliceGetter) getValue(ff *FilterField, v reflect.Value) error {
 			ff.appendFloat(element.Float())
 		case reflect.String:
 			ff.appendStr(element.String())
+		case reflect.Struct:
+			if element.Type() == reflect.TypeOf(time.Time{}) {
+				value, err := timeValueToStr(element)
+				if err != nil {
+					return err
+				}
+				ff.appendStr(value)
+			}
+		case reflect.Array:
+			if element.Type() == reflect.TypeOf(uuid.UUID{}) {
+				value, err := uuidValueToStr(element)
+				if err != nil {
+					return err
+				}
+				ff.appendStr(value)
+			}
 		}
 	}
 	return nil