diff --git a/entc/gen/internal/bindata.go b/entc/gen/internal/bindata.go
index 0f6f7ced2..ff7cf5390 100644
--- a/entc/gen/internal/bindata.go
+++ b/entc/gen/internal/bindata.go
@@ -779,7 +779,7 @@ func templateDialectSqlUpdateTmpl() (*asset, error) {
 	return a, nil
 }
 
-var _templateEntTmpl = 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+var _templateEntTmpl = 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
 func templateEntTmplBytes() ([]byte, error) {
 	return bindataRead(
@@ -794,7 +794,7 @@ func templateEntTmpl() (*asset, error) {
 		return nil, err
 	}
 
-	info := bindataFileInfo{name: "template/ent.tmpl", size: 4173, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
+	info := bindataFileInfo{name: "template/ent.tmpl", size: 4592, mode: os.FileMode(420), modTime: time.Unix(1, 0)}
 	a := &asset{bytes: bytes, info: info}
 	return a, nil
 }
diff --git a/entc/gen/template/ent.tmpl b/entc/gen/template/ent.tmpl
index b6a400fe7..15137d668 100644
--- a/entc/gen/template/ent.tmpl
+++ b/entc/gen/template/ent.tmpl
@@ -65,24 +65,39 @@ func ({{ $receiver }} *{{ $.Name }}) Unwrap() *{{ $.Name }} {
 
 // String implements the fmt.Stringer.
 func ({{ $receiver }} *{{ $.Name }}) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("{{ $.Name }}(")
-	buf.WriteString(fmt.Sprintf("id=%v", {{ $receiver }}.ID))
+	var builder strings.Builder
+	builder.WriteString("{{ $.Name }}(")
+	builder.WriteString(fmt.Sprintf("id=%v", {{ $receiver }}.ID))
 	{{- range $i, $f := $.Fields }}
 		{{- if $f.Sensitive }}
-			buf.WriteString(", {{ $f.Name }}={{ printf "<sensitive>" }}")
+			builder.WriteString(", {{ $f.Name }}=<sensitive>")
 		{{- else }}
+			{{- $sf := printf "%s.%s" $receiver $f.StructField }}
 			{{- if $f.Nillable }}
-				if v := {{ $receiver }}.{{ $f.StructField }}; v != nil {
-					buf.WriteString(fmt.Sprintf(", {{ $f.Name }}=%v", *v))
+				if v := {{ $sf }}; v != nil {
+					builder.WriteString(", {{ $f.Name }}=")
+					{{- if $f.IsTime }}
+						builder.WriteString(v.Format(time.ANSIC))
+					{{- else if $f.IsString }}
+						builder.WriteString(*v)
+					{{- else }}
+						builder.WriteString(fmt.Sprintf("%v", *v))
+					{{- end }}
 				}
 			{{- else }}
-				buf.WriteString(fmt.Sprintf(", {{ $f.Name }}=%v", {{ $receiver }}.{{ $f.StructField }}))
+				builder.WriteString(", {{ $f.Name }}=")
+				{{- if $f.IsTime }}
+					builder.WriteString({{ $sf }}.Format(time.ANSIC))
+				{{- else if $f.IsString }}
+					builder.WriteString({{ $sf }})
+				{{- else }}
+					builder.WriteString(fmt.Sprintf("%v", {{ $sf }}))
+				{{- end }}
 			{{- end }}
 		{{- end }}
 	{{- end }}
-	buf.WriteString(")")
-	return buf.String()
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 {{- if $.ID.IsString }}
@@ -115,4 +130,4 @@ func ({{ $receiver }} {{ $slice }}) config(cfg config) {
 {{ define "model/omittags" }}{{ with $.TagTypes }}`{{ range $i, $t := . }}{{ if ne $i 0 }} {{ end }}{{ $t }}:"-"{{ end }}`{{ end }}{{ end }}
 
 {{/* A template that can be overrided in order to add additional fields to the each type.*/}}
-{{ define "model/fields/additional" }}{{end}}
\ No newline at end of file
+{{ define "model/fields/additional" }}{{end}}
diff --git a/entc/integration/config/ent/user.go b/entc/integration/config/ent/user.go
index 5bd124326..c602468ea 100644
--- a/entc/integration/config/ent/user.go
+++ b/entc/integration/config/ent/user.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -55,11 +55,11 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/entc/integration/ent/card.go b/entc/integration/ent/card.go
index 92e7d23e8..c6cb8980d 100644
--- a/entc/integration/ent/card.go
+++ b/entc/integration/ent/card.go
@@ -7,9 +7,9 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/facebookincubator/ent/dialect/gremlin"
@@ -103,14 +103,17 @@ func (c *Card) Unwrap() *Card {
 
 // String implements the fmt.Stringer.
 func (c *Card) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Card(")
-	buf.WriteString(fmt.Sprintf("id=%v", c.ID))
-	buf.WriteString(fmt.Sprintf(", created_at=%v", c.CreatedAt))
-	buf.WriteString(fmt.Sprintf(", updated_at=%v", c.UpdatedAt))
-	buf.WriteString(fmt.Sprintf(", number=%v", c.Number))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Card(")
+	builder.WriteString(fmt.Sprintf("id=%v", c.ID))
+	builder.WriteString(", created_at=")
+	builder.WriteString(c.CreatedAt.Format(time.ANSIC))
+	builder.WriteString(", updated_at=")
+	builder.WriteString(c.UpdatedAt.Format(time.ANSIC))
+	builder.WriteString(", number=")
+	builder.WriteString(c.Number)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // id returns the int representation of the ID field.
diff --git a/entc/integration/ent/comment.go b/entc/integration/ent/comment.go
index 062d7b50e..57d24ff57 100644
--- a/entc/integration/ent/comment.go
+++ b/entc/integration/ent/comment.go
@@ -7,9 +7,9 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
 	"strconv"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/gremlin"
 	"github.com/facebookincubator/ent/dialect/sql"
@@ -97,16 +97,19 @@ func (c *Comment) Unwrap() *Comment {
 
 // String implements the fmt.Stringer.
 func (c *Comment) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Comment(")
-	buf.WriteString(fmt.Sprintf("id=%v", c.ID))
-	buf.WriteString(fmt.Sprintf(", unique_int=%v", c.UniqueInt))
-	buf.WriteString(fmt.Sprintf(", unique_float=%v", c.UniqueFloat))
+	var builder strings.Builder
+	builder.WriteString("Comment(")
+	builder.WriteString(fmt.Sprintf("id=%v", c.ID))
+	builder.WriteString(", unique_int=")
+	builder.WriteString(fmt.Sprintf("%v", c.UniqueInt))
+	builder.WriteString(", unique_float=")
+	builder.WriteString(fmt.Sprintf("%v", c.UniqueFloat))
 	if v := c.NillableInt; v != nil {
-		buf.WriteString(fmt.Sprintf(", nillable_int=%v", *v))
+		builder.WriteString(", nillable_int=")
+		builder.WriteString(fmt.Sprintf("%v", *v))
 	}
-	buf.WriteString(")")
-	return buf.String()
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // id returns the int representation of the ID field.
diff --git a/entc/integration/ent/fieldtype.go b/entc/integration/ent/fieldtype.go
index 34d319e67..fbcbc1e7b 100644
--- a/entc/integration/ent/fieldtype.go
+++ b/entc/integration/ent/fieldtype.go
@@ -7,9 +7,9 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
 	"strconv"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/gremlin"
 	"github.com/facebookincubator/ent/dialect/sql"
@@ -208,38 +208,55 @@ func (ft *FieldType) Unwrap() *FieldType {
 
 // String implements the fmt.Stringer.
 func (ft *FieldType) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("FieldType(")
-	buf.WriteString(fmt.Sprintf("id=%v", ft.ID))
-	buf.WriteString(fmt.Sprintf(", int=%v", ft.Int))
-	buf.WriteString(fmt.Sprintf(", int8=%v", ft.Int8))
-	buf.WriteString(fmt.Sprintf(", int16=%v", ft.Int16))
-	buf.WriteString(fmt.Sprintf(", int32=%v", ft.Int32))
-	buf.WriteString(fmt.Sprintf(", int64=%v", ft.Int64))
-	buf.WriteString(fmt.Sprintf(", optional_int=%v", ft.OptionalInt))
-	buf.WriteString(fmt.Sprintf(", optional_int8=%v", ft.OptionalInt8))
-	buf.WriteString(fmt.Sprintf(", optional_int16=%v", ft.OptionalInt16))
-	buf.WriteString(fmt.Sprintf(", optional_int32=%v", ft.OptionalInt32))
-	buf.WriteString(fmt.Sprintf(", optional_int64=%v", ft.OptionalInt64))
+	var builder strings.Builder
+	builder.WriteString("FieldType(")
+	builder.WriteString(fmt.Sprintf("id=%v", ft.ID))
+	builder.WriteString(", int=")
+	builder.WriteString(fmt.Sprintf("%v", ft.Int))
+	builder.WriteString(", int8=")
+	builder.WriteString(fmt.Sprintf("%v", ft.Int8))
+	builder.WriteString(", int16=")
+	builder.WriteString(fmt.Sprintf("%v", ft.Int16))
+	builder.WriteString(", int32=")
+	builder.WriteString(fmt.Sprintf("%v", ft.Int32))
+	builder.WriteString(", int64=")
+	builder.WriteString(fmt.Sprintf("%v", ft.Int64))
+	builder.WriteString(", optional_int=")
+	builder.WriteString(fmt.Sprintf("%v", ft.OptionalInt))
+	builder.WriteString(", optional_int8=")
+	builder.WriteString(fmt.Sprintf("%v", ft.OptionalInt8))
+	builder.WriteString(", optional_int16=")
+	builder.WriteString(fmt.Sprintf("%v", ft.OptionalInt16))
+	builder.WriteString(", optional_int32=")
+	builder.WriteString(fmt.Sprintf("%v", ft.OptionalInt32))
+	builder.WriteString(", optional_int64=")
+	builder.WriteString(fmt.Sprintf("%v", ft.OptionalInt64))
 	if v := ft.NillableInt; v != nil {
-		buf.WriteString(fmt.Sprintf(", nillable_int=%v", *v))
+		builder.WriteString(", nillable_int=")
+		builder.WriteString(fmt.Sprintf("%v", *v))
 	}
 	if v := ft.NillableInt8; v != nil {
-		buf.WriteString(fmt.Sprintf(", nillable_int8=%v", *v))
+		builder.WriteString(", nillable_int8=")
+		builder.WriteString(fmt.Sprintf("%v", *v))
 	}
 	if v := ft.NillableInt16; v != nil {
-		buf.WriteString(fmt.Sprintf(", nillable_int16=%v", *v))
+		builder.WriteString(", nillable_int16=")
+		builder.WriteString(fmt.Sprintf("%v", *v))
 	}
 	if v := ft.NillableInt32; v != nil {
-		buf.WriteString(fmt.Sprintf(", nillable_int32=%v", *v))
+		builder.WriteString(", nillable_int32=")
+		builder.WriteString(fmt.Sprintf("%v", *v))
 	}
 	if v := ft.NillableInt64; v != nil {
-		buf.WriteString(fmt.Sprintf(", nillable_int64=%v", *v))
+		builder.WriteString(", nillable_int64=")
+		builder.WriteString(fmt.Sprintf("%v", *v))
 	}
-	buf.WriteString(fmt.Sprintf(", validate_optional_int32=%v", ft.ValidateOptionalInt32))
-	buf.WriteString(fmt.Sprintf(", state=%v", ft.State))
-	buf.WriteString(")")
-	return buf.String()
+	builder.WriteString(", validate_optional_int32=")
+	builder.WriteString(fmt.Sprintf("%v", ft.ValidateOptionalInt32))
+	builder.WriteString(", state=")
+	builder.WriteString(fmt.Sprintf("%v", ft.State))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // id returns the int representation of the ID field.
diff --git a/entc/integration/ent/file.go b/entc/integration/ent/file.go
index e736693da..019abaaec 100644
--- a/entc/integration/ent/file.go
+++ b/entc/integration/ent/file.go
@@ -7,9 +7,9 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
 	"strconv"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/gremlin"
 	"github.com/facebookincubator/ent/dialect/sql"
@@ -114,17 +114,21 @@ func (f *File) Unwrap() *File {
 
 // String implements the fmt.Stringer.
 func (f *File) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("File(")
-	buf.WriteString(fmt.Sprintf("id=%v", f.ID))
-	buf.WriteString(fmt.Sprintf(", size=%v", f.Size))
-	buf.WriteString(fmt.Sprintf(", name=%v", f.Name))
+	var builder strings.Builder
+	builder.WriteString("File(")
+	builder.WriteString(fmt.Sprintf("id=%v", f.ID))
+	builder.WriteString(", size=")
+	builder.WriteString(fmt.Sprintf("%v", f.Size))
+	builder.WriteString(", name=")
+	builder.WriteString(f.Name)
 	if v := f.User; v != nil {
-		buf.WriteString(fmt.Sprintf(", user=%v", *v))
+		builder.WriteString(", user=")
+		builder.WriteString(*v)
 	}
-	buf.WriteString(fmt.Sprintf(", group=%v", f.Group))
-	buf.WriteString(")")
-	return buf.String()
+	builder.WriteString(", group=")
+	builder.WriteString(f.Group)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // id returns the int representation of the ID field.
diff --git a/entc/integration/ent/filetype.go b/entc/integration/ent/filetype.go
index 8f2aaba40..5a04399ae 100644
--- a/entc/integration/ent/filetype.go
+++ b/entc/integration/ent/filetype.go
@@ -7,9 +7,9 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
 	"strconv"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/gremlin"
 	"github.com/facebookincubator/ent/dialect/sql"
@@ -85,12 +85,13 @@ func (ft *FileType) Unwrap() *FileType {
 
 // String implements the fmt.Stringer.
 func (ft *FileType) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("FileType(")
-	buf.WriteString(fmt.Sprintf("id=%v", ft.ID))
-	buf.WriteString(fmt.Sprintf(", name=%v", ft.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("FileType(")
+	builder.WriteString(fmt.Sprintf("id=%v", ft.ID))
+	builder.WriteString(", name=")
+	builder.WriteString(ft.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // id returns the int representation of the ID field.
diff --git a/entc/integration/ent/group.go b/entc/integration/ent/group.go
index 49234320b..80eff1469 100644
--- a/entc/integration/ent/group.go
+++ b/entc/integration/ent/group.go
@@ -7,9 +7,9 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/facebookincubator/ent/dialect/gremlin"
@@ -132,18 +132,23 @@ func (gr *Group) Unwrap() *Group {
 
 // String implements the fmt.Stringer.
 func (gr *Group) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Group(")
-	buf.WriteString(fmt.Sprintf("id=%v", gr.ID))
-	buf.WriteString(fmt.Sprintf(", active=%v", gr.Active))
-	buf.WriteString(fmt.Sprintf(", expire=%v", gr.Expire))
+	var builder strings.Builder
+	builder.WriteString("Group(")
+	builder.WriteString(fmt.Sprintf("id=%v", gr.ID))
+	builder.WriteString(", active=")
+	builder.WriteString(fmt.Sprintf("%v", gr.Active))
+	builder.WriteString(", expire=")
+	builder.WriteString(gr.Expire.Format(time.ANSIC))
 	if v := gr.Type; v != nil {
-		buf.WriteString(fmt.Sprintf(", type=%v", *v))
+		builder.WriteString(", type=")
+		builder.WriteString(*v)
 	}
-	buf.WriteString(fmt.Sprintf(", max_users=%v", gr.MaxUsers))
-	buf.WriteString(fmt.Sprintf(", name=%v", gr.Name))
-	buf.WriteString(")")
-	return buf.String()
+	builder.WriteString(", max_users=")
+	builder.WriteString(fmt.Sprintf("%v", gr.MaxUsers))
+	builder.WriteString(", name=")
+	builder.WriteString(gr.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // id returns the int representation of the ID field.
diff --git a/entc/integration/ent/groupinfo.go b/entc/integration/ent/groupinfo.go
index 130001226..48697db5a 100644
--- a/entc/integration/ent/groupinfo.go
+++ b/entc/integration/ent/groupinfo.go
@@ -7,9 +7,9 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
 	"strconv"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/gremlin"
 	"github.com/facebookincubator/ent/dialect/sql"
@@ -92,13 +92,15 @@ func (gi *GroupInfo) Unwrap() *GroupInfo {
 
 // String implements the fmt.Stringer.
 func (gi *GroupInfo) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("GroupInfo(")
-	buf.WriteString(fmt.Sprintf("id=%v", gi.ID))
-	buf.WriteString(fmt.Sprintf(", desc=%v", gi.Desc))
-	buf.WriteString(fmt.Sprintf(", max_users=%v", gi.MaxUsers))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("GroupInfo(")
+	builder.WriteString(fmt.Sprintf("id=%v", gi.ID))
+	builder.WriteString(", desc=")
+	builder.WriteString(gi.Desc)
+	builder.WriteString(", max_users=")
+	builder.WriteString(fmt.Sprintf("%v", gi.MaxUsers))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // id returns the int representation of the ID field.
diff --git a/entc/integration/ent/item.go b/entc/integration/ent/item.go
index 1469c5720..11536f942 100644
--- a/entc/integration/ent/item.go
+++ b/entc/integration/ent/item.go
@@ -7,9 +7,9 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
 	"strconv"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/gremlin"
 	"github.com/facebookincubator/ent/dialect/sql"
@@ -73,11 +73,11 @@ func (i *Item) Unwrap() *Item {
 
 // String implements the fmt.Stringer.
 func (i *Item) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Item(")
-	buf.WriteString(fmt.Sprintf("id=%v", i.ID))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Item(")
+	builder.WriteString(fmt.Sprintf("id=%v", i.ID))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // id returns the int representation of the ID field.
diff --git a/entc/integration/ent/node.go b/entc/integration/ent/node.go
index 6997b41ec..b131ff841 100644
--- a/entc/integration/ent/node.go
+++ b/entc/integration/ent/node.go
@@ -7,9 +7,9 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
 	"strconv"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/gremlin"
 	"github.com/facebookincubator/ent/dialect/sql"
@@ -90,12 +90,13 @@ func (n *Node) Unwrap() *Node {
 
 // String implements the fmt.Stringer.
 func (n *Node) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Node(")
-	buf.WriteString(fmt.Sprintf("id=%v", n.ID))
-	buf.WriteString(fmt.Sprintf(", value=%v", n.Value))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Node(")
+	builder.WriteString(fmt.Sprintf("id=%v", n.ID))
+	builder.WriteString(", value=")
+	builder.WriteString(fmt.Sprintf("%v", n.Value))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // id returns the int representation of the ID field.
diff --git a/entc/integration/ent/pet.go b/entc/integration/ent/pet.go
index eb9ae2551..b492da6ba 100644
--- a/entc/integration/ent/pet.go
+++ b/entc/integration/ent/pet.go
@@ -7,9 +7,9 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
 	"strconv"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/gremlin"
 	"github.com/facebookincubator/ent/dialect/sql"
@@ -90,12 +90,13 @@ func (pe *Pet) Unwrap() *Pet {
 
 // String implements the fmt.Stringer.
 func (pe *Pet) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Pet(")
-	buf.WriteString(fmt.Sprintf("id=%v", pe.ID))
-	buf.WriteString(fmt.Sprintf(", name=%v", pe.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Pet(")
+	builder.WriteString(fmt.Sprintf("id=%v", pe.ID))
+	builder.WriteString(", name=")
+	builder.WriteString(pe.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // id returns the int representation of the ID field.
diff --git a/entc/integration/ent/user.go b/entc/integration/ent/user.go
index d68641684..1d8994470 100644
--- a/entc/integration/ent/user.go
+++ b/entc/integration/ent/user.go
@@ -7,9 +7,9 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
 	"strconv"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/gremlin"
 	"github.com/facebookincubator/ent/dialect/sql"
@@ -170,17 +170,22 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", age=%v", u.Age))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(fmt.Sprintf(", last=%v", u.Last))
-	buf.WriteString(fmt.Sprintf(", nickname=%v", u.Nickname))
-	buf.WriteString(fmt.Sprintf(", phone=%v", u.Phone))
-	buf.WriteString(", password=<sensitive>")
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", age=")
+	builder.WriteString(fmt.Sprintf("%v", u.Age))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteString(", last=")
+	builder.WriteString(u.Last)
+	builder.WriteString(", nickname=")
+	builder.WriteString(u.Nickname)
+	builder.WriteString(", phone=")
+	builder.WriteString(u.Phone)
+	builder.WriteString(", password=<sensitive>")
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // id returns the int representation of the ID field.
diff --git a/entc/integration/idtype/ent/user.go b/entc/integration/idtype/ent/user.go
index 486794d54..740d4a3eb 100644
--- a/entc/integration/idtype/ent/user.go
+++ b/entc/integration/idtype/ent/user.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -75,12 +75,13 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/entc/integration/json/ent/user.go b/entc/integration/json/ent/user.go
index 25618af6e..8ee524822 100644
--- a/entc/integration/json/ent/user.go
+++ b/entc/integration/json/ent/user.go
@@ -7,11 +7,11 @@
 package ent
 
 import (
-	"bytes"
 	"encoding/json"
 	"fmt"
 	"net/http"
 	"net/url"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -112,17 +112,23 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", url=%v", u.URL))
-	buf.WriteString(fmt.Sprintf(", raw=%v", u.Raw))
-	buf.WriteString(fmt.Sprintf(", dirs=%v", u.Dirs))
-	buf.WriteString(fmt.Sprintf(", ints=%v", u.Ints))
-	buf.WriteString(fmt.Sprintf(", floats=%v", u.Floats))
-	buf.WriteString(fmt.Sprintf(", strings=%v", u.Strings))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", url=")
+	builder.WriteString(fmt.Sprintf("%v", u.URL))
+	builder.WriteString(", raw=")
+	builder.WriteString(fmt.Sprintf("%v", u.Raw))
+	builder.WriteString(", dirs=")
+	builder.WriteString(fmt.Sprintf("%v", u.Dirs))
+	builder.WriteString(", ints=")
+	builder.WriteString(fmt.Sprintf("%v", u.Ints))
+	builder.WriteString(", floats=")
+	builder.WriteString(fmt.Sprintf("%v", u.Floats))
+	builder.WriteString(", strings=")
+	builder.WriteString(fmt.Sprintf("%v", u.Strings))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/entc/integration/migrate/entv1/user.go b/entc/integration/migrate/entv1/user.go
index 870653f56..712b7f172 100644
--- a/entc/integration/migrate/entv1/user.go
+++ b/entc/integration/migrate/entv1/user.go
@@ -7,8 +7,8 @@
 package entv1
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 	"github.com/facebookincubator/ent/entc/integration/migrate/entv1/user"
@@ -86,17 +86,23 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", age=%v", u.Age))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(fmt.Sprintf(", address=%v", u.Address))
-	buf.WriteString(fmt.Sprintf(", renamed=%v", u.Renamed))
-	buf.WriteString(fmt.Sprintf(", blob=%v", u.Blob))
-	buf.WriteString(fmt.Sprintf(", state=%v", u.State))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", age=")
+	builder.WriteString(fmt.Sprintf("%v", u.Age))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteString(", address=")
+	builder.WriteString(u.Address)
+	builder.WriteString(", renamed=")
+	builder.WriteString(u.Renamed)
+	builder.WriteString(", blob=")
+	builder.WriteString(fmt.Sprintf("%v", u.Blob))
+	builder.WriteString(", state=")
+	builder.WriteString(fmt.Sprintf("%v", u.State))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/entc/integration/migrate/entv2/group.go b/entc/integration/migrate/entv2/group.go
index f793c481e..f2e010c69 100644
--- a/entc/integration/migrate/entv2/group.go
+++ b/entc/integration/migrate/entv2/group.go
@@ -7,8 +7,8 @@
 package entv2
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -55,11 +55,11 @@ func (gr *Group) Unwrap() *Group {
 
 // String implements the fmt.Stringer.
 func (gr *Group) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Group(")
-	buf.WriteString(fmt.Sprintf("id=%v", gr.ID))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Group(")
+	builder.WriteString(fmt.Sprintf("id=%v", gr.ID))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Groups is a parsable slice of Group.
diff --git a/entc/integration/migrate/entv2/pet.go b/entc/integration/migrate/entv2/pet.go
index e9f9d6b17..994b2136c 100644
--- a/entc/integration/migrate/entv2/pet.go
+++ b/entc/integration/migrate/entv2/pet.go
@@ -7,8 +7,8 @@
 package entv2
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -55,11 +55,11 @@ func (pe *Pet) Unwrap() *Pet {
 
 // String implements the fmt.Stringer.
 func (pe *Pet) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Pet(")
-	buf.WriteString(fmt.Sprintf("id=%v", pe.ID))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Pet(")
+	builder.WriteString(fmt.Sprintf("id=%v", pe.ID))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Pets is a parsable slice of Pet.
diff --git a/entc/integration/migrate/entv2/user.go b/entc/integration/migrate/entv2/user.go
index 56de11542..25e48cc69 100644
--- a/entc/integration/migrate/entv2/user.go
+++ b/entc/integration/migrate/entv2/user.go
@@ -7,8 +7,8 @@
 package entv2
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 	"github.com/facebookincubator/ent/entc/integration/migrate/entv2/user"
@@ -96,19 +96,27 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", age=%v", u.Age))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(fmt.Sprintf(", phone=%v", u.Phone))
-	buf.WriteString(fmt.Sprintf(", buffer=%v", u.Buffer))
-	buf.WriteString(fmt.Sprintf(", title=%v", u.Title))
-	buf.WriteString(fmt.Sprintf(", new_name=%v", u.NewName))
-	buf.WriteString(fmt.Sprintf(", blob=%v", u.Blob))
-	buf.WriteString(fmt.Sprintf(", state=%v", u.State))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", age=")
+	builder.WriteString(fmt.Sprintf("%v", u.Age))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteString(", phone=")
+	builder.WriteString(u.Phone)
+	builder.WriteString(", buffer=")
+	builder.WriteString(fmt.Sprintf("%v", u.Buffer))
+	builder.WriteString(", title=")
+	builder.WriteString(u.Title)
+	builder.WriteString(", new_name=")
+	builder.WriteString(u.NewName)
+	builder.WriteString(", blob=")
+	builder.WriteString(fmt.Sprintf("%v", u.Blob))
+	builder.WriteString(", state=")
+	builder.WriteString(fmt.Sprintf("%v", u.State))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/entc/integration/template/ent/group.go b/entc/integration/template/ent/group.go
index 0433a054e..8b6abef29 100644
--- a/entc/integration/template/ent/group.go
+++ b/entc/integration/template/ent/group.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -60,12 +60,13 @@ func (gr *Group) Unwrap() *Group {
 
 // String implements the fmt.Stringer.
 func (gr *Group) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Group(")
-	buf.WriteString(fmt.Sprintf("id=%v", gr.ID))
-	buf.WriteString(fmt.Sprintf(", max_users=%v", gr.MaxUsers))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Group(")
+	builder.WriteString(fmt.Sprintf("id=%v", gr.ID))
+	builder.WriteString(", max_users=")
+	builder.WriteString(fmt.Sprintf("%v", gr.MaxUsers))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Groups is a parsable slice of Group.
diff --git a/entc/integration/template/ent/pet.go b/entc/integration/template/ent/pet.go
index de2704585..a2145d730 100644
--- a/entc/integration/template/ent/pet.go
+++ b/entc/integration/template/ent/pet.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/facebookincubator/ent/dialect/sql"
@@ -74,15 +74,17 @@ func (pe *Pet) Unwrap() *Pet {
 
 // String implements the fmt.Stringer.
 func (pe *Pet) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Pet(")
-	buf.WriteString(fmt.Sprintf("id=%v", pe.ID))
-	buf.WriteString(fmt.Sprintf(", age=%v", pe.Age))
+	var builder strings.Builder
+	builder.WriteString("Pet(")
+	builder.WriteString(fmt.Sprintf("id=%v", pe.ID))
+	builder.WriteString(", age=")
+	builder.WriteString(fmt.Sprintf("%v", pe.Age))
 	if v := pe.LicensedAt; v != nil {
-		buf.WriteString(fmt.Sprintf(", licensed_at=%v", *v))
+		builder.WriteString(", licensed_at=")
+		builder.WriteString(v.Format(time.ANSIC))
 	}
-	buf.WriteString(")")
-	return buf.String()
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Pets is a parsable slice of Pet.
diff --git a/entc/integration/template/ent/user.go b/entc/integration/template/ent/user.go
index 3af85d0a7..33c1ef7e7 100644
--- a/entc/integration/template/ent/user.go
+++ b/entc/integration/template/ent/user.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -70,12 +70,13 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/examples/edgeindex/ent/city.go b/examples/edgeindex/ent/city.go
index 927fa649d..79bafc514 100644
--- a/examples/edgeindex/ent/city.go
+++ b/examples/edgeindex/ent/city.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -65,12 +65,13 @@ func (c *City) Unwrap() *City {
 
 // String implements the fmt.Stringer.
 func (c *City) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("City(")
-	buf.WriteString(fmt.Sprintf("id=%v", c.ID))
-	buf.WriteString(fmt.Sprintf(", name=%v", c.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("City(")
+	builder.WriteString(fmt.Sprintf("id=%v", c.ID))
+	builder.WriteString(", name=")
+	builder.WriteString(c.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Cities is a parsable slice of City.
diff --git a/examples/edgeindex/ent/street.go b/examples/edgeindex/ent/street.go
index c9c6f64eb..3e21e6ea7 100644
--- a/examples/edgeindex/ent/street.go
+++ b/examples/edgeindex/ent/street.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -65,12 +65,13 @@ func (s *Street) Unwrap() *Street {
 
 // String implements the fmt.Stringer.
 func (s *Street) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Street(")
-	buf.WriteString(fmt.Sprintf("id=%v", s.ID))
-	buf.WriteString(fmt.Sprintf(", name=%v", s.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Street(")
+	builder.WriteString(fmt.Sprintf("id=%v", s.ID))
+	builder.WriteString(", name=")
+	builder.WriteString(s.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Streets is a parsable slice of Street.
diff --git a/examples/entcpkg/ent/user.go b/examples/entcpkg/ent/user.go
index 5bd124326..c602468ea 100644
--- a/examples/entcpkg/ent/user.go
+++ b/examples/entcpkg/ent/user.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -55,11 +55,11 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/examples/m2m2types/ent/group.go b/examples/m2m2types/ent/group.go
index 03f7eb285..381c34baf 100644
--- a/examples/m2m2types/ent/group.go
+++ b/examples/m2m2types/ent/group.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -65,12 +65,13 @@ func (gr *Group) Unwrap() *Group {
 
 // String implements the fmt.Stringer.
 func (gr *Group) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Group(")
-	buf.WriteString(fmt.Sprintf("id=%v", gr.ID))
-	buf.WriteString(fmt.Sprintf(", name=%v", gr.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Group(")
+	builder.WriteString(fmt.Sprintf("id=%v", gr.ID))
+	builder.WriteString(", name=")
+	builder.WriteString(gr.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Groups is a parsable slice of Group.
diff --git a/examples/m2m2types/ent/user.go b/examples/m2m2types/ent/user.go
index 8eb266207..30dd93d50 100644
--- a/examples/m2m2types/ent/user.go
+++ b/examples/m2m2types/ent/user.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -70,13 +70,15 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", age=%v", u.Age))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", age=")
+	builder.WriteString(fmt.Sprintf("%v", u.Age))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/examples/m2mbidi/ent/user.go b/examples/m2mbidi/ent/user.go
index 34ebd9955..df4d8707a 100644
--- a/examples/m2mbidi/ent/user.go
+++ b/examples/m2mbidi/ent/user.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -70,13 +70,15 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", age=%v", u.Age))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", age=")
+	builder.WriteString(fmt.Sprintf("%v", u.Age))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/examples/m2mrecur/ent/user.go b/examples/m2mrecur/ent/user.go
index 11c8bb5c2..9ef05438c 100644
--- a/examples/m2mrecur/ent/user.go
+++ b/examples/m2mrecur/ent/user.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -75,13 +75,15 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", age=%v", u.Age))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", age=")
+	builder.WriteString(fmt.Sprintf("%v", u.Age))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/examples/o2m2types/ent/pet.go b/examples/o2m2types/ent/pet.go
index c150305a8..af895849f 100644
--- a/examples/o2m2types/ent/pet.go
+++ b/examples/o2m2types/ent/pet.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -65,12 +65,13 @@ func (pe *Pet) Unwrap() *Pet {
 
 // String implements the fmt.Stringer.
 func (pe *Pet) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Pet(")
-	buf.WriteString(fmt.Sprintf("id=%v", pe.ID))
-	buf.WriteString(fmt.Sprintf(", name=%v", pe.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Pet(")
+	builder.WriteString(fmt.Sprintf("id=%v", pe.ID))
+	builder.WriteString(", name=")
+	builder.WriteString(pe.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Pets is a parsable slice of Pet.
diff --git a/examples/o2m2types/ent/user.go b/examples/o2m2types/ent/user.go
index 94c8cd6dd..a1617faf5 100644
--- a/examples/o2m2types/ent/user.go
+++ b/examples/o2m2types/ent/user.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -70,13 +70,15 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", age=%v", u.Age))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", age=")
+	builder.WriteString(fmt.Sprintf("%v", u.Age))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/examples/o2mrecur/ent/node.go b/examples/o2mrecur/ent/node.go
index 536846af0..39da90e83 100644
--- a/examples/o2mrecur/ent/node.go
+++ b/examples/o2mrecur/ent/node.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -70,12 +70,13 @@ func (n *Node) Unwrap() *Node {
 
 // String implements the fmt.Stringer.
 func (n *Node) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Node(")
-	buf.WriteString(fmt.Sprintf("id=%v", n.ID))
-	buf.WriteString(fmt.Sprintf(", value=%v", n.Value))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Node(")
+	builder.WriteString(fmt.Sprintf("id=%v", n.ID))
+	builder.WriteString(", value=")
+	builder.WriteString(fmt.Sprintf("%v", n.Value))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Nodes is a parsable slice of Node.
diff --git a/examples/o2o2types/ent/card.go b/examples/o2o2types/ent/card.go
index 1e1dfcd2e..33d79d8dd 100644
--- a/examples/o2o2types/ent/card.go
+++ b/examples/o2o2types/ent/card.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/facebookincubator/ent/dialect/sql"
@@ -71,13 +71,15 @@ func (c *Card) Unwrap() *Card {
 
 // String implements the fmt.Stringer.
 func (c *Card) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Card(")
-	buf.WriteString(fmt.Sprintf("id=%v", c.ID))
-	buf.WriteString(fmt.Sprintf(", expired=%v", c.Expired))
-	buf.WriteString(fmt.Sprintf(", number=%v", c.Number))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Card(")
+	builder.WriteString(fmt.Sprintf("id=%v", c.ID))
+	builder.WriteString(", expired=")
+	builder.WriteString(c.Expired.Format(time.ANSIC))
+	builder.WriteString(", number=")
+	builder.WriteString(c.Number)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Cards is a parsable slice of Card.
diff --git a/examples/o2o2types/ent/user.go b/examples/o2o2types/ent/user.go
index 63ba658e1..b1e9538a5 100644
--- a/examples/o2o2types/ent/user.go
+++ b/examples/o2o2types/ent/user.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -70,13 +70,15 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", age=%v", u.Age))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", age=")
+	builder.WriteString(fmt.Sprintf("%v", u.Age))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/examples/o2obidi/ent/user.go b/examples/o2obidi/ent/user.go
index 67befccb8..b6ab7f1ac 100644
--- a/examples/o2obidi/ent/user.go
+++ b/examples/o2obidi/ent/user.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -70,13 +70,15 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", age=%v", u.Age))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", age=")
+	builder.WriteString(fmt.Sprintf("%v", u.Age))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/examples/o2orecur/ent/node.go b/examples/o2orecur/ent/node.go
index ffb20f13f..0dbb3dbd5 100644
--- a/examples/o2orecur/ent/node.go
+++ b/examples/o2orecur/ent/node.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -70,12 +70,13 @@ func (n *Node) Unwrap() *Node {
 
 // String implements the fmt.Stringer.
 func (n *Node) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Node(")
-	buf.WriteString(fmt.Sprintf("id=%v", n.ID))
-	buf.WriteString(fmt.Sprintf(", value=%v", n.Value))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Node(")
+	builder.WriteString(fmt.Sprintf("id=%v", n.ID))
+	builder.WriteString(", value=")
+	builder.WriteString(fmt.Sprintf("%v", n.Value))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Nodes is a parsable slice of Node.
diff --git a/examples/start/ent/car.go b/examples/start/ent/car.go
index 3614f32c4..745f8dd10 100644
--- a/examples/start/ent/car.go
+++ b/examples/start/ent/car.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/facebookincubator/ent/dialect/sql"
@@ -71,13 +71,15 @@ func (c *Car) Unwrap() *Car {
 
 // String implements the fmt.Stringer.
 func (c *Car) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Car(")
-	buf.WriteString(fmt.Sprintf("id=%v", c.ID))
-	buf.WriteString(fmt.Sprintf(", model=%v", c.Model))
-	buf.WriteString(fmt.Sprintf(", registered_at=%v", c.RegisteredAt))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Car(")
+	builder.WriteString(fmt.Sprintf("id=%v", c.ID))
+	builder.WriteString(", model=")
+	builder.WriteString(c.Model)
+	builder.WriteString(", registered_at=")
+	builder.WriteString(c.RegisteredAt.Format(time.ANSIC))
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Cars is a parsable slice of Car.
diff --git a/examples/start/ent/group.go b/examples/start/ent/group.go
index 03f7eb285..381c34baf 100644
--- a/examples/start/ent/group.go
+++ b/examples/start/ent/group.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -65,12 +65,13 @@ func (gr *Group) Unwrap() *Group {
 
 // String implements the fmt.Stringer.
 func (gr *Group) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Group(")
-	buf.WriteString(fmt.Sprintf("id=%v", gr.ID))
-	buf.WriteString(fmt.Sprintf(", name=%v", gr.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Group(")
+	builder.WriteString(fmt.Sprintf("id=%v", gr.ID))
+	builder.WriteString(", name=")
+	builder.WriteString(gr.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Groups is a parsable slice of Group.
diff --git a/examples/start/ent/user.go b/examples/start/ent/user.go
index ea6921b57..5678af7c4 100644
--- a/examples/start/ent/user.go
+++ b/examples/start/ent/user.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -75,13 +75,15 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", age=%v", u.Age))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", age=")
+	builder.WriteString(fmt.Sprintf("%v", u.Age))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.
diff --git a/examples/traversal/ent/group.go b/examples/traversal/ent/group.go
index 1ad5fb182..8e4db36ad 100644
--- a/examples/traversal/ent/group.go
+++ b/examples/traversal/ent/group.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -70,12 +70,13 @@ func (gr *Group) Unwrap() *Group {
 
 // String implements the fmt.Stringer.
 func (gr *Group) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Group(")
-	buf.WriteString(fmt.Sprintf("id=%v", gr.ID))
-	buf.WriteString(fmt.Sprintf(", name=%v", gr.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Group(")
+	builder.WriteString(fmt.Sprintf("id=%v", gr.ID))
+	builder.WriteString(", name=")
+	builder.WriteString(gr.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Groups is a parsable slice of Group.
diff --git a/examples/traversal/ent/pet.go b/examples/traversal/ent/pet.go
index fef711de8..4a3bbe0b4 100644
--- a/examples/traversal/ent/pet.go
+++ b/examples/traversal/ent/pet.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -70,12 +70,13 @@ func (pe *Pet) Unwrap() *Pet {
 
 // String implements the fmt.Stringer.
 func (pe *Pet) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("Pet(")
-	buf.WriteString(fmt.Sprintf("id=%v", pe.ID))
-	buf.WriteString(fmt.Sprintf(", name=%v", pe.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("Pet(")
+	builder.WriteString(fmt.Sprintf("id=%v", pe.ID))
+	builder.WriteString(", name=")
+	builder.WriteString(pe.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Pets is a parsable slice of Pet.
diff --git a/examples/traversal/ent/user.go b/examples/traversal/ent/user.go
index 350078fdc..818549297 100644
--- a/examples/traversal/ent/user.go
+++ b/examples/traversal/ent/user.go
@@ -7,8 +7,8 @@
 package ent
 
 import (
-	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/facebookincubator/ent/dialect/sql"
 )
@@ -85,13 +85,15 @@ func (u *User) Unwrap() *User {
 
 // String implements the fmt.Stringer.
 func (u *User) String() string {
-	buf := bytes.NewBuffer(nil)
-	buf.WriteString("User(")
-	buf.WriteString(fmt.Sprintf("id=%v", u.ID))
-	buf.WriteString(fmt.Sprintf(", age=%v", u.Age))
-	buf.WriteString(fmt.Sprintf(", name=%v", u.Name))
-	buf.WriteString(")")
-	return buf.String()
+	var builder strings.Builder
+	builder.WriteString("User(")
+	builder.WriteString(fmt.Sprintf("id=%v", u.ID))
+	builder.WriteString(", age=")
+	builder.WriteString(fmt.Sprintf("%v", u.Age))
+	builder.WriteString(", name=")
+	builder.WriteString(u.Name)
+	builder.WriteByte(')')
+	return builder.String()
 }
 
 // Users is a parsable slice of User.