Refactor struct's time to remove unnecessary memory usage (#3142)

* refactor struct's time to remove unnecessary memory usage

* use AsTimePtr simple code

* fix tests

* fix time compare

* fix template on gpg

* use AddDuration instead of Add

models/attachment.go

@@ -10,11 +10,11 @@ import (
 	"mime/multipart"
 	"os"
 	"path"
-	"time"
 
 	gouuid "github.com/satori/go.uuid"
 
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/util"
 )
 
 // Attachment represent a attachment of issue/comment/release.
@@ -25,15 +25,8 @@ type Attachment struct {
 	ReleaseID     int64  `xorm:"INDEX"`
 	CommentID     int64
 	Name          string
-	DownloadCount int64     `xorm:"DEFAULT 0"`
-	Created       time.Time `xorm:"-"`
-	CreatedUnix   int64     `xorm:"created"`
-}
-
-// AfterLoad is invoked from XORM after setting the value of a field of
-// this object.
-func (a *Attachment) AfterLoad() {
-	a.Created = time.Unix(a.CreatedUnix, 0).Local()
+	DownloadCount int64          `xorm:"DEFAULT 0"`
+	CreatedUnix   util.TimeStamp `xorm:"created"`
 }
 
 // IncreaseDownloadCount is update download count + 1