[FEAT] allow setting the update date on issues and comments

This field adds the possibility to set the update date when modifying
an issue through the API.

A 'NoAutoDate' in-memory field is added in the Issue struct.
If the update_at field is set, NoAutoDate is set to true and the
Issue's UpdatedUnix field is filled.

That information is passed down to the functions that actually updates
the database, which have been modified to not auto update dates if
requested.

A guard is added to the 'EditIssue' API call, to checks that the
udpate_at date is between the issue's creation date and the current
date (to avoid 'malicious' changes). It also limits the new feature
to project's owners and admins.

(cherry picked from commit c524d33402)

Add a SetIssueUpdateDate() function in services/issue.go

That function is used by some API calls to set the NoAutoDate and
UpdatedUnix fields of an Issue if an updated_at date is provided.

(cherry picked from commit f061caa655)

Add an updated_at field to the API calls related to Issue's Labels.

The update date is applied to the issue's comment created to inform
about the modification of the issue's labels.

(cherry picked from commit ea36cf80f5)

Add an updated_at field to the API call for issue's attachment creation

The update date is applied to the issue's comment created to inform
about the modification of the issue's content, and is set as the
asset creation date.

(cherry picked from commit 96150971ca)

Checking Issue changes, with and without providing an updated_at date

Those unit tests are added:

- TestAPIEditIssueWithAutoDate
- TestAPIEditIssueWithNoAutoDate

- TestAPIAddIssueLabelsWithAutoDate
- TestAPIAddIssueLabelsWithNoAutoDate

- TestAPICreateIssueAttachmentWithAutoDate
- TestAPICreateIssueAttachmentWithNoAutoDate

(cherry picked from commit 4926a5d7a2)

Add an updated_at field to the API call for issue's comment creation

The update date is used as the comment creation date, and is applied to
the issue as the update creation date.

(cherry picked from commit 76c8faecdc)

Add an updated_at field to the API call for issue's comment edition

The update date is used as the comment update date, and is applied to
the issue as an update date.

(cherry picked from commit cf787ad7fd)

Add an updated_at field to the API call for comment's attachment creation

The update date is applied to the comment, and is set as the asset
creation date.

(cherry picked from commit 1e4ff424d3)

Checking Comment changes, with and without providing an updated_at date

Those unit tests are added:

- TestAPICreateCommentWithAutoDate
- TestAPICreateCommentWithNoAutoDate

- TestAPIEditCommentWithAutoDate
- TestAPIEditCommentWithNoAutoDate

- TestAPICreateCommentAttachmentWithAutoDate
- TestAPICreateCommentAttachmentWithNoAutoDate

(cherry picked from commit da932152f1)

Pettier code to set the update time of comments

Now uses sess.AllCols().NoAutoToime().SetExpr("updated_unix", ...)

XORM is smart enough to compose one single SQL UPDATE which all
columns + updated_unix.

(cherry picked from commit 1f6a42808d)

Issue edition: Keep the max of the milestone and issue update dates.

When editing an issue via the API, an updated_at date can be provided.
If the EditIssue call changes the issue's milestone, the milestone's
update date is to be changed accordingly, but only with a greater
value.

This ensures that a milestone's update date is the max of all issue's
update dates.

(cherry picked from commit 8f22ea182e)

Rewrite the 'AutoDate' tests using subtests

Also add a test to check the permissions to set a date, and a test
to check update dates on milestones.

The tests related to 'AutoDate' are:
- TestAPIEditIssueAutoDate
- TestAPIAddIssueLabelsAutoDate
- TestAPIEditIssueMilestoneAutoDate
- TestAPICreateIssueAttachmentAutoDate
- TestAPICreateCommentAutoDate
- TestAPIEditCommentWithDate
- TestAPICreateCommentAttachmentAutoDate

(cherry picked from commit 961fd13c55)
(cherry picked from commit d52f4eea44)
(cherry picked from commit 3540ea2a43)

Conflicts:
	services/issue/issue.go
	https://codeberg.org/forgejo/forgejo/pulls/1415
(cherry picked from commit 56720ade00)

Conflicts:
	routers/api/v1/repo/issue_label.go
	https://codeberg.org/forgejo/forgejo/pulls/1462
(cherry picked from commit 47c78927d6)
(cherry picked from commit 2030f3b965)

models/issues/comment.go

@@ -817,6 +817,11 @@ func CreateComment(ctx context.Context, opts *CreateCommentOptions) (_ *Comment,
 		IsForcePush:      opts.IsForcePush,
 		Invalidated:      opts.Invalidated,
 	}
+	if opts.Issue.NoAutoTime {
+		comment.CreatedUnix = opts.Issue.UpdatedUnix
+		comment.UpdatedUnix = opts.Issue.UpdatedUnix
+		e.NoAutoTime()
+	}
 	if _, err = e.Insert(comment); err != nil {
 		return nil, err
 	}
@@ -1095,9 +1100,17 @@ func UpdateComment(ctx context.Context, c *Comment, doer *user_model.User) error
 		return err
 	}
 	defer committer.Close()
-	sess := db.GetEngine(ctx)
 
-	if _, err := sess.ID(c.ID).AllCols().Update(c); err != nil {
+	sess := db.GetEngine(ctx).ID(c.ID).AllCols()
+	if c.Issue.NoAutoTime {
+		// update the DataBase
+		sess = sess.NoAutoTime().SetExpr("updated_unix", c.Issue.UpdatedUnix)
+		// the UpdatedUnix value of the Comment also has to be set,
+		// to return the adequate valuè
+		// see https://codeberg.org/forgejo/forgejo/pulls/764#issuecomment-1023801
+		c.UpdatedUnix = c.Issue.UpdatedUnix
+	}
+	if _, err := sess.Update(c); err != nil {
 		return err
 	}
 	if err := c.LoadIssue(ctx); err != nil {

models/issues/issue.go

@@ -126,6 +126,7 @@ type Issue struct {
 	CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
 	UpdatedUnix timeutil.TimeStamp `xorm:"INDEX updated"`
 	ClosedUnix  timeutil.TimeStamp `xorm:"INDEX"`
+	NoAutoTime  bool               `xorm:"-"`
 
 	Attachments      []*repo_model.Attachment `xorm:"-"`
 	Comments         CommentList              `xorm:"-"`

models/issues/issue_update.go

@@ -27,7 +27,12 @@ import (
 
 // UpdateIssueCols updates cols of issue
 func UpdateIssueCols(ctx context.Context, issue *Issue, cols ...string) error {
-	if _, err := db.GetEngine(ctx).ID(issue.ID).Cols(cols...).Update(issue); err != nil {
+	sess := db.GetEngine(ctx).ID(issue.ID)
+	if issue.NoAutoTime {
+		cols = append(cols, []string{"updated_unix"}...)
+		sess.NoAutoTime()
+	}
+	if _, err := sess.Cols(cols...).Update(issue); err != nil {
 		return err
 	}
 	return nil
@@ -71,7 +76,11 @@ func doChangeIssueStatus(ctx context.Context, issue *Issue, doer *user_model.Use
 	}
 
 	if issue.IsClosed {
-		issue.ClosedUnix = timeutil.TimeStampNow()
+		if issue.NoAutoTime {
+			issue.ClosedUnix = issue.UpdatedUnix
+		} else {
+			issue.ClosedUnix = timeutil.TimeStampNow()
+		}
 	} else {
 		issue.ClosedUnix = 0
 	}
@@ -92,8 +101,14 @@ func doChangeIssueStatus(ctx context.Context, issue *Issue, doer *user_model.Use
 
 	// Update issue count of milestone
 	if issue.MilestoneID > 0 {
-		if err := UpdateMilestoneCounters(ctx, issue.MilestoneID); err != nil {
-			return nil, err
+		if issue.NoAutoTime {
+			if err := UpdateMilestoneCountersWithDate(ctx, issue.MilestoneID, issue.UpdatedUnix); err != nil {
+				return nil, err
+			}
+		} else {
+			if err := UpdateMilestoneCounters(ctx, issue.MilestoneID); err != nil {
+				return nil, err
+			}
 		}
 	}
 
@@ -259,8 +274,12 @@ func ChangeIssueContent(ctx context.Context, issue *Issue, doer *user_model.User
 		return fmt.Errorf("UpdateIssueCols: %w", err)
 	}
 
+	historyDate := timeutil.TimeStampNow()
+	if issue.NoAutoTime {
+		historyDate = issue.UpdatedUnix
+	}
 	if err = SaveIssueContentHistory(ctx, doer.ID, issue.ID, 0,
-		timeutil.TimeStampNow(), issue.Content, false); err != nil {
+		historyDate, issue.Content, false); err != nil {
 		return fmt.Errorf("SaveIssueContentHistory: %w", err)
 	}
 
@@ -449,10 +468,13 @@ func UpdateIssueByAPI(ctx context.Context, issue *Issue, doer *user_model.User)
 		return nil, false, err
 	}
 
-	if _, err := db.GetEngine(ctx).ID(issue.ID).Cols(
-		"name", "content", "milestone_id", "priority",
-		"deadline_unix", "updated_unix", "is_locked").
-		Update(issue); err != nil {
+	sess := db.GetEngine(ctx).ID(issue.ID)
+	cols := []string{"name", "content", "milestone_id", "priority", "deadline_unix", "is_locked"}
+	if issue.NoAutoTime {
+		cols = append(cols, "updated_unix")
+		sess.NoAutoTime()
+	}
+	if _, err := sess.Cols(cols...).Update(issue); err != nil {
 		return nil, false, err
 	}
 
@@ -498,7 +520,7 @@ func UpdateIssueDeadline(ctx context.Context, issue *Issue, deadlineUnix timeuti
 	defer committer.Close()
 
 	// Update the deadline
-	if err = UpdateIssueCols(ctx, &Issue{ID: issue.ID, DeadlineUnix: deadlineUnix}, "deadline_unix"); err != nil {
+	if err = UpdateIssueCols(ctx, &Issue{ID: issue.ID, DeadlineUnix: deadlineUnix, NoAutoTime: issue.NoAutoTime, UpdatedUnix: issue.UpdatedUnix}, "deadline_unix"); err != nil {
 		return err
 	}
 

models/issues/issue_xref.go

@@ -110,6 +110,10 @@ func (issue *Issue) createCrossReferences(stdCtx context.Context, ctx *crossRefe
 		if ctx.OrigComment != nil {
 			refCommentID = ctx.OrigComment.ID
 		}
+		if ctx.OrigIssue.NoAutoTime {
+			xref.Issue.NoAutoTime = true
+			xref.Issue.UpdatedUnix = ctx.OrigIssue.UpdatedUnix
+		}
 		opts := &CreateCommentOptions{
 			Type:         ctx.Type,
 			Doer:         ctx.Doer,

models/issues/milestone.go

@@ -187,10 +187,9 @@ func updateMilestone(ctx context.Context, m *Milestone) error {
 	return UpdateMilestoneCounters(ctx, m.ID)
 }
 
-// UpdateMilestoneCounters calculates NumIssues, NumClosesIssues and Completeness
-func UpdateMilestoneCounters(ctx context.Context, id int64) error {
+func updateMilestoneCounters(ctx context.Context, id int64, noAutoTime bool, updatedUnix timeutil.TimeStamp) error {
 	e := db.GetEngine(ctx)
-	_, err := e.ID(id).
+	sess := e.ID(id).
 		SetExpr("num_issues", builder.Select("count(*)").From("issue").Where(
 			builder.Eq{"milestone_id": id},
 		)).
@@ -199,8 +198,11 @@ func UpdateMilestoneCounters(ctx context.Context, id int64) error {
 				"milestone_id": id,
 				"is_closed":    true,
 			},
-		)).
-		Update(&Milestone{})
+		))
+	if noAutoTime {
+		sess.SetExpr("updated_unix", updatedUnix).NoAutoTime()
+	}
+	_, err := sess.Update(&Milestone{})
 	if err != nil {
 		return err
 	}
@@ -210,6 +212,16 @@ func UpdateMilestoneCounters(ctx context.Context, id int64) error {
 	return err
 }
 
+// UpdateMilestoneCounters calculates NumIssues, NumClosesIssues and Completeness
+func UpdateMilestoneCounters(ctx context.Context, id int64) error {
+	return updateMilestoneCounters(ctx, id, false, 0)
+}
+
+// UpdateMilestoneCountersWithDate calculates NumIssues, NumClosesIssues and Completeness and set the UpdatedUnix date
+func UpdateMilestoneCountersWithDate(ctx context.Context, id int64, updatedUnix timeutil.TimeStamp) error {
+	return updateMilestoneCounters(ctx, id, true, updatedUnix)
+}
+
 // ChangeMilestoneStatusByRepoIDAndID changes a milestone open/closed status if the milestone ID is in the repo.
 func ChangeMilestoneStatusByRepoIDAndID(ctx context.Context, repoID, milestoneID int64, isClosed bool) error {
 	ctx, committer, err := db.TxContext(ctx)

models/repo/attachment.go

@@ -28,6 +28,7 @@ type Attachment struct {
 	Name              string
 	DownloadCount     int64              `xorm:"DEFAULT 0"`
 	Size              int64              `xorm:"DEFAULT 0"`
+	NoAutoTime        bool               `xorm:"-"`
 	CreatedUnix       timeutil.TimeStamp `xorm:"created"`
 	CustomDownloadURL string             `xorm:"-"`
 }

modules/structs/issue.go

@@ -110,6 +110,8 @@ type EditIssueOption struct {
 	// swagger:strfmt date-time
 	Deadline       *time.Time `json:"due_date"`
 	RemoveDeadline *bool      `json:"unset_due_date"`
+	// swagger:strfmt date-time
+	Updated *time.Time `json:"updated_at"`
 }
 
 // EditDeadlineOption options for creating a deadline

modules/structs/issue_comment.go

@@ -28,12 +28,16 @@ type Comment struct {
 type CreateIssueCommentOption struct {
 	// required:true
 	Body string `json:"body" binding:"Required"`
+	// swagger:strfmt date-time
+	Updated *time.Time `json:"updated_at"`
 }
 
 // EditIssueCommentOption options for editing a comment
 type EditIssueCommentOption struct {
 	// required: true
 	Body string `json:"body" binding:"Required"`
+	// swagger:strfmt date-time
+	Updated *time.Time `json:"updated_at"`
 }
 
 // TimelineComment represents a timeline comment (comment of any type) on a commit or issue

modules/structs/issue_label.go

@@ -4,6 +4,10 @@
 
 package structs
 
+import (
+	"time"
+)
+
 // Label a label to an issue or a pr
 // swagger:model
 type Label struct {
@@ -45,10 +49,18 @@ type EditLabelOption struct {
 	IsArchived *bool `json:"is_archived"`
 }
 
+// DeleteLabelOption options for deleting a label
+type DeleteLabelsOption struct {
+	// swagger:strfmt date-time
+	Updated *time.Time `json:"updated_at"`
+}
+
 // IssueLabelsOption a collection of labels
 type IssueLabelsOption struct {
 	// list of label IDs
 	Labels []int64 `json:"labels"`
+	// swagger:strfmt date-time
+	Updated *time.Time `json:"updated_at"`
 }
 
 // LabelTemplate info of a Label template

routers/api/v1/api.go

@@ -1333,8 +1333,8 @@ func Routes() *web.Route {
 							m.Combo("").Get(repo.ListIssueLabels).
 								Post(reqToken(), bind(api.IssueLabelsOption{}), repo.AddIssueLabels).
 								Put(reqToken(), bind(api.IssueLabelsOption{}), repo.ReplaceIssueLabels).
-								Delete(reqToken(), repo.ClearIssueLabels)
-							m.Delete("/{id}", reqToken(), repo.DeleteIssueLabel)
+								Delete(reqToken(), bind(api.DeleteLabelsOption{}), repo.ClearIssueLabels)
+							m.Delete("/{id}", reqToken(), bind(api.DeleteLabelsOption{}), repo.DeleteIssueLabel)
 						})
 						m.Group("/times", func() {
 							m.Combo("").

routers/api/v1/repo/issue.go

@@ -780,6 +780,12 @@ func EditIssue(ctx *context.APIContext) {
 		return
 	}
 
+	err = issue_service.SetIssueUpdateDate(ctx, issue, form.Updated, ctx.Doer)
+	if err != nil {
+		ctx.Error(http.StatusForbidden, "SetIssueUpdateDate", err)
+		return
+	}
+
 	oldTitle := issue.Title
 	if len(form.Title) > 0 {
 		issue.Title = form.Title

routers/api/v1/repo/issue_attachment.go

@@ -5,6 +5,7 @@ package repo
 
 import (
 	"net/http"
+	"time"
 
 	issues_model "code.gitea.io/gitea/models/issues"
 	repo_model "code.gitea.io/gitea/models/repo"
@@ -141,6 +142,11 @@ func CreateIssueAttachment(ctx *context.APIContext) {
 	//   description: name of the attachment
 	//   type: string
 	//   required: false
+	// - name: updated_at
+	//   in: query
+	//   description: time of the attachment's creation. This is a timestamp in RFC 3339 format
+	//   type: string
+	//   format: date-time
 	// - name: attachment
 	//   in: formData
 	//   description: attachment to upload
@@ -165,6 +171,20 @@ func CreateIssueAttachment(ctx *context.APIContext) {
 		return
 	}
 
+	updatedAt := ctx.Req.FormValue("updated_at")
+	if len(updatedAt) != 0 {
+		updated, err := time.Parse(time.RFC3339, updatedAt)
+		if err != nil {
+			ctx.Error(http.StatusInternalServerError, "time.Parse", err)
+			return
+		}
+		err = issue_service.SetIssueUpdateDate(ctx, issue, &updated, ctx.Doer)
+		if err != nil {
+			ctx.Error(http.StatusForbidden, "SetIssueUpdateDate", err)
+			return
+		}
+	}
+
 	// Get uploaded file from request
 	file, header, err := ctx.Req.FormFile("attachment")
 	if err != nil {
@@ -179,10 +199,12 @@ func CreateIssueAttachment(ctx *context.APIContext) {
 	}
 
 	attachment, err := attachment.UploadAttachment(file, setting.Attachment.AllowedTypes, header.Size, &repo_model.Attachment{
-		Name:       filename,
-		UploaderID: ctx.Doer.ID,
-		RepoID:     ctx.Repo.Repository.ID,
-		IssueID:    issue.ID,
+		Name:        filename,
+		UploaderID:  ctx.Doer.ID,
+		RepoID:      ctx.Repo.Repository.ID,
+		IssueID:     issue.ID,
+		NoAutoTime:  issue.NoAutoTime,
+		CreatedUnix: issue.UpdatedUnix,
 	})
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "UploadAttachment", err)

routers/api/v1/repo/issue_comment.go

@@ -372,6 +372,12 @@ func CreateIssueComment(ctx *context.APIContext) {
 		return
 	}
 
+	err = issue_service.SetIssueUpdateDate(ctx, issue, form.Updated, ctx.Doer)
+	if err != nil {
+		ctx.Error(http.StatusForbidden, "SetIssueUpdateDate", err)
+		return
+	}
+
 	comment, err := issue_service.CreateIssueComment(ctx, ctx.Doer, ctx.Repo.Repository, issue, form.Body, nil)
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "CreateIssueComment", err)
@@ -565,6 +571,17 @@ func editIssueComment(ctx *context.APIContext, form api.EditIssueCommentOption)
 		return
 	}
 
+	err = comment.LoadIssue(ctx)
+	if err != nil {
+		ctx.Error(http.StatusInternalServerError, "LoadIssue", err)
+		return
+	}
+	err = issue_service.SetIssueUpdateDate(ctx, comment.Issue, form.Updated, ctx.Doer)
+	if err != nil {
+		ctx.Error(http.StatusForbidden, "SetIssueUpdateDate", err)
+		return
+	}
+
 	oldContent := comment.Content
 	comment.Content = form.Body
 	if err := issue_service.UpdateComment(ctx, comment, ctx.Doer, oldContent); err != nil {

routers/api/v1/repo/issue_comment_attachment.go

@@ -5,6 +5,7 @@ package repo
 
 import (
 	"net/http"
+	"time"
 
 	issues_model "code.gitea.io/gitea/models/issues"
 	repo_model "code.gitea.io/gitea/models/repo"
@@ -144,6 +145,11 @@ func CreateIssueCommentAttachment(ctx *context.APIContext) {
 	//   description: name of the attachment
 	//   type: string
 	//   required: false
+	// - name: updated_at
+	//   in: query
+	//   description: time of the attachment's creation. This is a timestamp in RFC 3339 format
+	//   type: string
+	//   format: date-time
 	// - name: attachment
 	//   in: formData
 	//   description: attachment to upload
@@ -169,6 +175,25 @@ func CreateIssueCommentAttachment(ctx *context.APIContext) {
 		return
 	}
 
+	updatedAt := ctx.Req.FormValue("updated_at")
+	if len(updatedAt) != 0 {
+		updated, err := time.Parse(time.RFC3339, updatedAt)
+		if err != nil {
+			ctx.Error(http.StatusInternalServerError, "time.Parse", err)
+			return
+		}
+		err = comment.LoadIssue(ctx)
+		if err != nil {
+			ctx.Error(http.StatusInternalServerError, "LoadIssue", err)
+			return
+		}
+		err = issue_service.SetIssueUpdateDate(ctx, comment.Issue, &updated, ctx.Doer)
+		if err != nil {
+			ctx.Error(http.StatusForbidden, "SetIssueUpdateDate", err)
+			return
+		}
+	}
+
 	// Get uploaded file from request
 	file, header, err := ctx.Req.FormFile("attachment")
 	if err != nil {
@@ -183,11 +208,13 @@ func CreateIssueCommentAttachment(ctx *context.APIContext) {
 	}
 
 	attachment, err := attachment.UploadAttachment(file, setting.Attachment.AllowedTypes, header.Size, &repo_model.Attachment{
-		Name:       filename,
-		UploaderID: ctx.Doer.ID,
-		RepoID:     ctx.Repo.Repository.ID,
-		IssueID:    comment.IssueID,
-		CommentID:  comment.ID,
+		Name:        filename,
+		UploaderID:  ctx.Doer.ID,
+		RepoID:      ctx.Repo.Repository.ID,
+		IssueID:     comment.IssueID,
+		CommentID:   comment.ID,
+		NoAutoTime:  comment.Issue.NoAutoTime,
+		CreatedUnix: comment.Issue.UpdatedUnix,
 	})
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "UploadAttachment", err)

routers/api/v1/repo/issue_label.go

@@ -151,6 +151,10 @@ func DeleteIssueLabel(ctx *context.APIContext) {
 	//   type: integer
 	//   format: int64
 	//   required: true
+	// - name: body
+	//   in: body
+	//   schema:
+	//     "$ref": "#/definitions/DeleteLabelsOption"
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
@@ -160,6 +164,7 @@ func DeleteIssueLabel(ctx *context.APIContext) {
 	//     "$ref": "#/responses/notFound"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+	form := web.GetForm(ctx).(*api.DeleteLabelsOption)
 
 	issue, err := issues_model.GetIssueByIndex(ctx, ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
@@ -176,6 +181,11 @@ func DeleteIssueLabel(ctx *context.APIContext) {
 		return
 	}
 
+	if err := issue_service.SetIssueUpdateDate(ctx, issue, form.Updated, ctx.Doer); err != nil {
+		ctx.Error(http.StatusForbidden, "SetIssueUpdateDate", err)
+		return
+	}
+
 	label, err := issues_model.GetLabelByID(ctx, ctx.ParamsInt64(":id"))
 	if err != nil {
 		if issues_model.IsErrLabelNotExist(err) {
@@ -275,6 +285,10 @@ func ClearIssueLabels(ctx *context.APIContext) {
 	//   type: integer
 	//   format: int64
 	//   required: true
+	// - name: body
+	//   in: body
+	//   schema:
+	//     "$ref": "#/definitions/DeleteLabelsOption"
 	// responses:
 	//   "204":
 	//     "$ref": "#/responses/empty"
@@ -282,6 +296,7 @@ func ClearIssueLabels(ctx *context.APIContext) {
 	//     "$ref": "#/responses/forbidden"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+	form := web.GetForm(ctx).(*api.DeleteLabelsOption)
 
 	issue, err := issues_model.GetIssueByIndex(ctx, ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
@@ -298,6 +313,11 @@ func ClearIssueLabels(ctx *context.APIContext) {
 		return
 	}
 
+	if err := issue_service.SetIssueUpdateDate(ctx, issue, form.Updated, ctx.Doer); err != nil {
+		ctx.Error(http.StatusForbidden, "SetIssueUpdateDate", err)
+		return
+	}
+
 	if err := issue_service.ClearLabels(ctx, issue, ctx.Doer); err != nil {
 		ctx.Error(http.StatusInternalServerError, "ClearLabels", err)
 		return
@@ -328,5 +348,11 @@ func prepareForReplaceOrAdd(ctx *context.APIContext, form api.IssueLabelsOption)
 		return nil, nil, nil
 	}
 
+	err = issue_service.SetIssueUpdateDate(ctx, issue, form.Updated, ctx.Doer)
+	if err != nil {
+		ctx.Error(http.StatusForbidden, "SetIssueUpdateDate", err)
+		return nil, nil, err
+	}
+
 	return issue, labels, err
 }

routers/api/v1/swagger/options.go

@@ -47,6 +47,9 @@ type swaggerParameterBodies struct {
 	// in:body
 	IssueLabelsOption api.IssueLabelsOption
 
+	// in:body
+	DeleteLabelsOption api.DeleteLabelsOption
+
 	// in:body
 	CreateKeyOption api.CreateKeyOption
 

services/attachment/attachment.go

@@ -32,7 +32,12 @@ func NewAttachment(attach *repo_model.Attachment, file io.Reader, size int64) (*
 		}
 		attach.Size = size
 
-		return db.Insert(ctx, attach)
+		eng := db.GetEngine(ctx)
+		if attach.NoAutoTime {
+			eng.NoAutoTime()
+		}
+		_, err = eng.Insert(attach)
+		return err
 	})
 
 	return attach, err

services/issue/comments.go

@@ -89,7 +89,11 @@ func UpdateComment(ctx context.Context, c *issues_model.Comment, doer *user_mode
 	}
 
 	if needsContentHistory {
-		err := issues_model.SaveIssueContentHistory(ctx, doer.ID, c.IssueID, c.ID, timeutil.TimeStampNow(), c.Content, false)
+		historyDate := timeutil.TimeStampNow()
+		if c.Issue.NoAutoTime {
+			historyDate = c.Issue.UpdatedUnix
+		}
+		err := issues_model.SaveIssueContentHistory(ctx, doer.ID, c.IssueID, c.ID, historyDate, c.Content, false)
 		if err != nil {
 			return err
 		}

services/issue/issue.go

@@ -6,6 +6,7 @@ package issue
 import (
 	"context"
 	"fmt"
+	"time"
 
 	activities_model "code.gitea.io/gitea/models/activities"
 	"code.gitea.io/gitea/models/db"
@@ -17,6 +18,7 @@ import (
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/storage"
+	"code.gitea.io/gitea/modules/timeutil"
 	notify_service "code.gitea.io/gitea/services/notify"
 )
 
@@ -286,3 +288,40 @@ func deleteIssue(ctx context.Context, issue *issues_model.Issue) error {
 
 	return committer.Commit()
 }
+
+// Set the UpdatedUnix date and the NoAutoTime field of an Issue if a non
+// nil 'updated' time is provided
+//
+// In order to set a specific update time, the DB will be updated with
+// NoAutoTime(). A 'NoAutoTime' boolean field in the Issue struct is used to
+// propagate down to the DB update calls the will to apply autoupdate or not.
+func SetIssueUpdateDate(ctx context.Context, issue *issues_model.Issue, updated *time.Time, doer *user_model.User) error {
+	issue.NoAutoTime = false
+	if updated == nil {
+		return nil
+	}
+
+	if err := issue.LoadRepo(ctx); err != nil {
+		return err
+	}
+
+	// Check if the poster is allowed to set an update date
+	perm, err := access_model.GetUserRepoPermission(ctx, issue.Repo, doer)
+	if err != nil {
+		return err
+	}
+	if !perm.IsAdmin() && !perm.IsOwner() {
+		return fmt.Errorf("user needs to have admin or owner right")
+	}
+
+	// A simple guard against potential inconsistent calls
+	updatedUnix := timeutil.TimeStamp(updated.Unix())
+	if updatedUnix < issue.CreatedUnix || updatedUnix > timeutil.TimeStampNow() {
+		return fmt.Errorf("unallowed update date")
+	}
+
+	issue.UpdatedUnix = updatedUnix
+	issue.NoAutoTime = true
+
+	return nil
+}

services/issue/milestone.go

@@ -13,6 +13,32 @@ import (
 	notify_service "code.gitea.io/gitea/services/notify"
 )
 
+func updateMilestoneCounters(ctx context.Context, issue *issues_model.Issue, id int64) error {
+	if issue.NoAutoTime {
+		// We set the milestone's update date to the max of the
+		// milestone and issue update dates.
+		// Note: we can not call UpdateMilestoneCounters() if the
+		// milestone's update date is to be kept, because that function
+		// auto-updates the dates.
+		milestone, err := issues_model.GetMilestoneByRepoID(ctx, issue.RepoID, id)
+		if err != nil {
+			return fmt.Errorf("GetMilestoneByRepoID: %w", err)
+		}
+		updatedUnix := milestone.UpdatedUnix
+		if issue.UpdatedUnix > updatedUnix {
+			updatedUnix = issue.UpdatedUnix
+		}
+		if err := issues_model.UpdateMilestoneCountersWithDate(ctx, id, updatedUnix); err != nil {
+			return err
+		}
+	} else {
+		if err := issues_model.UpdateMilestoneCounters(ctx, id); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func changeMilestoneAssign(ctx context.Context, doer *user_model.User, issue *issues_model.Issue, oldMilestoneID int64) error {
 	// Only check if milestone exists if we don't remove it.
 	if issue.MilestoneID > 0 {
@@ -30,13 +56,13 @@ func changeMilestoneAssign(ctx context.Context, doer *user_model.User, issue *is
 	}
 
 	if oldMilestoneID > 0 {
-		if err := issues_model.UpdateMilestoneCounters(ctx, oldMilestoneID); err != nil {
+		if err := updateMilestoneCounters(ctx, issue, oldMilestoneID); err != nil {
 			return err
 		}
 	}
 
 	if issue.MilestoneID > 0 {
-		if err := issues_model.UpdateMilestoneCounters(ctx, issue.MilestoneID); err != nil {
+		if err := updateMilestoneCounters(ctx, issue, issue.MilestoneID); err != nil {
 			return err
 		}
 	}

templates/swagger/v1_json.tmpl

@@ -6473,6 +6473,13 @@
             "name": "name",
             "in": "query"
           },
+          {
+            "type": "string",
+            "format": "date-time",
+            "description": "time of the attachment's creation. This is a timestamp in RFC 3339 format",
+            "name": "updated_at",
+            "in": "query"
+          },
           {
             "type": "file",
             "description": "attachment to upload",
@@ -7092,6 +7099,13 @@
             "name": "name",
             "in": "query"
           },
+          {
+            "type": "string",
+            "format": "date-time",
+            "description": "time of the attachment's creation. This is a timestamp in RFC 3339 format",
+            "name": "updated_at",
+            "in": "query"
+          },
           {
             "type": "file",
             "description": "attachment to upload",
@@ -8067,6 +8081,13 @@
             "name": "index",
             "in": "path",
             "required": true
+          },
+          {
+            "name": "body",
+            "in": "body",
+            "schema": {
+              "$ref": "#/definitions/DeleteLabelsOption"
+            }
           }
         ],
         "responses": {
@@ -8122,6 +8143,13 @@
             "name": "id",
             "in": "path",
             "required": true
+          },
+          {
+            "name": "body",
+            "in": "body",
+            "schema": {
+              "$ref": "#/definitions/DeleteLabelsOption"
+            }
           }
         ],
         "responses": {
@@ -17802,6 +17830,11 @@
         "body": {
           "type": "string",
           "x-go-name": "Body"
+        },
+        "updated_at": {
+          "type": "string",
+          "format": "date-time",
+          "x-go-name": "Updated"
         }
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"
@@ -18554,6 +18587,18 @@
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"
     },
+    "DeleteLabelsOption": {
+      "description": "DeleteLabelOption options for deleting a label",
+      "type": "object",
+      "properties": {
+        "updated_at": {
+          "type": "string",
+          "format": "date-time",
+          "x-go-name": "Updated"
+        }
+      },
+      "x-go-package": "code.gitea.io/gitea/modules/structs"
+    },
     "DeployKey": {
       "description": "DeployKey a deploy key",
       "type": "object",
@@ -18807,6 +18852,11 @@
         "body": {
           "type": "string",
           "x-go-name": "Body"
+        },
+        "updated_at": {
+          "type": "string",
+          "format": "date-time",
+          "x-go-name": "Updated"
         }
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"
@@ -18856,6 +18906,11 @@
         "unset_due_date": {
           "type": "boolean",
           "x-go-name": "RemoveDeadline"
+        },
+        "updated_at": {
+          "type": "string",
+          "format": "date-time",
+          "x-go-name": "Updated"
         }
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"
@@ -20270,6 +20325,11 @@
             "format": "int64"
           },
           "x-go-name": "Labels"
+        },
+        "updated_at": {
+          "type": "string",
+          "format": "date-time",
+          "x-go-name": "Updated"
         }
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"

tests/integration/api_comment_attachment_test.go

@@ -11,6 +11,7 @@ import (
 	"mime/multipart"
 	"net/http"
 	"testing"
+	"time"
 
 	auth_model "code.gitea.io/gitea/models/auth"
 	"code.gitea.io/gitea/models/db"
@@ -111,6 +112,82 @@ func TestAPICreateCommentAttachment(t *testing.T) {
 	unittest.AssertExistsAndLoadBean(t, &repo_model.Attachment{ID: apiAttachment.ID, CommentID: comment.ID})
 }
 
+func TestAPICreateCommentAttachmentAutoDate(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	comment := unittest.AssertExistsAndLoadBean(t, &issues_model.Comment{ID: 2})
+	issue := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: comment.IssueID})
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: issue.RepoID})
+	repoOwner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})
+
+	session := loginUser(t, repoOwner.Name)
+	token := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeWriteIssue)
+	urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/comments/%d/assets?token=%s",
+		repoOwner.Name, repo.Name, comment.ID, token)
+
+	filename := "image.png"
+	buff := generateImg()
+	body := &bytes.Buffer{}
+
+	t.Run("WithAutoDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		// Setup multi-part
+		writer := multipart.NewWriter(body)
+		part, err := writer.CreateFormFile("attachment", filename)
+		assert.NoError(t, err)
+		_, err = io.Copy(part, &buff)
+		assert.NoError(t, err)
+		err = writer.Close()
+		assert.NoError(t, err)
+
+		req := NewRequestWithBody(t, "POST", urlStr, body)
+		req.Header.Add("Content-Type", writer.FormDataContentType())
+		resp := session.MakeRequest(t, req, http.StatusCreated)
+		apiAttachment := new(api.Attachment)
+		DecodeJSON(t, resp, &apiAttachment)
+
+		unittest.AssertExistsAndLoadBean(t, &repo_model.Attachment{ID: apiAttachment.ID})
+		// the execution of the API call supposedly lasted less than one minute
+		updatedSince := time.Since(apiAttachment.Created)
+		assert.LessOrEqual(t, updatedSince, time.Minute)
+
+		commentAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Comment{ID: comment.ID})
+		updatedSince = time.Since(commentAfter.UpdatedUnix.AsTime())
+		assert.LessOrEqual(t, updatedSince, time.Minute)
+	})
+
+	t.Run("WithUpdateDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		updatedAt := time.Now().Add(-time.Hour).Truncate(time.Second)
+		urlStr += fmt.Sprintf("&updated_at=%s", updatedAt.UTC().Format(time.RFC3339))
+
+		// Setup multi-part
+		writer := multipart.NewWriter(body)
+		part, err := writer.CreateFormFile("attachment", filename)
+		assert.NoError(t, err)
+		_, err = io.Copy(part, &buff)
+		assert.NoError(t, err)
+		err = writer.Close()
+		assert.NoError(t, err)
+
+		req := NewRequestWithBody(t, "POST", urlStr, body)
+		req.Header.Add("Content-Type", writer.FormDataContentType())
+		resp := session.MakeRequest(t, req, http.StatusCreated)
+		apiAttachment := new(api.Attachment)
+		DecodeJSON(t, resp, &apiAttachment)
+
+		// dates will be converted into the same tz, in order to compare them
+		utcTZ, _ := time.LoadLocation("UTC")
+		unittest.AssertExistsAndLoadBean(t, &repo_model.Attachment{ID: apiAttachment.ID})
+		assert.Equal(t, updatedAt.In(utcTZ), apiAttachment.Created.In(utcTZ))
+
+		commentAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Comment{ID: comment.ID})
+		assert.Equal(t, updatedAt.In(utcTZ), commentAfter.UpdatedUnix.AsTime().In(utcTZ))
+	})
+}
+
 func TestAPIEditCommentAttachment(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()
 

tests/integration/api_comment_test.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/url"
 	"testing"
+	"time"
 
 	auth_model "code.gitea.io/gitea/models/auth"
 	"code.gitea.io/gitea/models/db"
@@ -110,6 +111,58 @@ func TestAPICreateComment(t *testing.T) {
 	unittest.AssertExistsAndLoadBean(t, &issues_model.Comment{ID: updatedComment.ID, IssueID: issue.ID, Content: commentBody})
 }
 
+func TestAPICreateCommentAutoDate(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	issue := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{})
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: issue.RepoID})
+	repoOwner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})
+	token := getUserToken(t, repoOwner.Name, auth_model.AccessTokenScopeWriteIssue)
+
+	urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d/comments?token=%s",
+		repoOwner.Name, repo.Name, issue.Index, token)
+	const commentBody = "Comment body"
+
+	t.Run("WithAutoDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequestWithValues(t, "POST", urlStr, map[string]string{
+			"body": commentBody,
+		})
+		resp := MakeRequest(t, req, http.StatusCreated)
+		var updatedComment api.Comment
+		DecodeJSON(t, resp, &updatedComment)
+
+		// the execution of the API call supposedly lasted less than one minute
+		updatedSince := time.Since(updatedComment.Updated)
+		assert.LessOrEqual(t, updatedSince, time.Minute)
+
+		commentAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Comment{ID: updatedComment.ID, IssueID: issue.ID, Content: commentBody})
+		updatedSince = time.Since(commentAfter.UpdatedUnix.AsTime())
+		assert.LessOrEqual(t, updatedSince, time.Minute)
+	})
+
+	t.Run("WithUpdateDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		updatedAt := time.Now().Add(-time.Hour).Truncate(time.Second)
+
+		req := NewRequestWithJSON(t, "POST", urlStr, &api.CreateIssueCommentOption{
+			Body:    commentBody,
+			Updated: &updatedAt,
+		})
+		resp := MakeRequest(t, req, http.StatusCreated)
+		var updatedComment api.Comment
+		DecodeJSON(t, resp, &updatedComment)
+
+		// dates will be converted into the same tz, in order to compare them
+		utcTZ, _ := time.LoadLocation("UTC")
+		assert.Equal(t, updatedAt.In(utcTZ), updatedComment.Updated.In(utcTZ))
+		commentAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Comment{ID: updatedComment.ID, IssueID: issue.ID, Content: commentBody})
+		assert.Equal(t, updatedAt.In(utcTZ), commentAfter.UpdatedUnix.AsTime().In(utcTZ))
+	})
+}
+
 func TestAPIGetComment(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()
 
@@ -161,6 +214,60 @@ func TestAPIEditComment(t *testing.T) {
 	unittest.AssertExistsAndLoadBean(t, &issues_model.Comment{ID: comment.ID, IssueID: issue.ID, Content: newCommentBody})
 }
 
+func TestAPIEditCommentWithDate(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	comment := unittest.AssertExistsAndLoadBean(t, &issues_model.Comment{},
+		unittest.Cond("type = ?", issues_model.CommentTypeComment))
+	issue := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: comment.IssueID})
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: issue.RepoID})
+	repoOwner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})
+	token := getUserToken(t, repoOwner.Name, auth_model.AccessTokenScopeWriteIssue)
+
+	urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/comments/%d?token=%s",
+		repoOwner.Name, repo.Name, comment.ID, token)
+	const newCommentBody = "This is the new comment body"
+
+	t.Run("WithAutoDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequestWithValues(t, "PATCH", urlStr, map[string]string{
+			"body": newCommentBody,
+		})
+		resp := MakeRequest(t, req, http.StatusOK)
+		var updatedComment api.Comment
+		DecodeJSON(t, resp, &updatedComment)
+
+		// the execution of the API call supposedly lasted less than one minute
+		updatedSince := time.Since(updatedComment.Updated)
+		assert.LessOrEqual(t, updatedSince, time.Minute)
+
+		commentAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Comment{ID: comment.ID, IssueID: issue.ID, Content: newCommentBody})
+		updatedSince = time.Since(commentAfter.UpdatedUnix.AsTime())
+		assert.LessOrEqual(t, updatedSince, time.Minute)
+	})
+
+	t.Run("WithUpdateDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		updatedAt := time.Now().Add(-time.Hour).Truncate(time.Second)
+
+		req := NewRequestWithJSON(t, "PATCH", urlStr, &api.EditIssueCommentOption{
+			Body:    newCommentBody,
+			Updated: &updatedAt,
+		})
+		resp := MakeRequest(t, req, http.StatusOK)
+		var updatedComment api.Comment
+		DecodeJSON(t, resp, &updatedComment)
+
+		// dates will be converted into the same tz, in order to compare them
+		utcTZ, _ := time.LoadLocation("UTC")
+		assert.Equal(t, updatedAt.In(utcTZ), updatedComment.Updated.In(utcTZ))
+		commentAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Comment{ID: comment.ID, IssueID: issue.ID, Content: newCommentBody})
+		assert.Equal(t, updatedAt.In(utcTZ), commentAfter.UpdatedUnix.AsTime().In(utcTZ))
+	})
+}
+
 func TestAPIDeleteComment(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()
 

tests/integration/api_issue_attachment_test.go

@@ -11,6 +11,7 @@ import (
 	"mime/multipart"
 	"net/http"
 	"testing"
+	"time"
 
 	auth_model "code.gitea.io/gitea/models/auth"
 	issues_model "code.gitea.io/gitea/models/issues"
@@ -100,6 +101,82 @@ func TestAPICreateIssueAttachment(t *testing.T) {
 	unittest.AssertExistsAndLoadBean(t, &repo_model.Attachment{ID: apiAttachment.ID, IssueID: issue.ID})
 }
 
+func TestAPICreateIssueAttachmentAutoDate(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	issue := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{RepoID: repo.ID})
+	repoOwner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})
+
+	session := loginUser(t, repoOwner.Name)
+	token := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeWriteIssue)
+	urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d/assets?token=%s",
+		repoOwner.Name, repo.Name, issue.Index, token)
+
+	filename := "image.png"
+	buff := generateImg()
+	body := &bytes.Buffer{}
+
+	t.Run("WithAutoDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		// Setup multi-part
+		writer := multipart.NewWriter(body)
+		part, err := writer.CreateFormFile("attachment", filename)
+		assert.NoError(t, err)
+		_, err = io.Copy(part, &buff)
+		assert.NoError(t, err)
+		err = writer.Close()
+		assert.NoError(t, err)
+
+		req := NewRequestWithBody(t, "POST", urlStr, body)
+		req.Header.Add("Content-Type", writer.FormDataContentType())
+		resp := session.MakeRequest(t, req, http.StatusCreated)
+
+		apiAttachment := new(api.Attachment)
+		DecodeJSON(t, resp, &apiAttachment)
+
+		unittest.AssertExistsAndLoadBean(t, &repo_model.Attachment{ID: apiAttachment.ID, IssueID: issue.ID})
+		// the execution of the API call supposedly lasted less than one minute
+		updatedSince := time.Since(apiAttachment.Created)
+		assert.LessOrEqual(t, updatedSince, time.Minute)
+
+		issueAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: issue.Index})
+		updatedSince = time.Since(issueAfter.UpdatedUnix.AsTime())
+		assert.LessOrEqual(t, updatedSince, time.Minute)
+	})
+
+	t.Run("WithUpdateDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		updatedAt := time.Now().Add(-time.Hour).Truncate(time.Second)
+		urlStr += fmt.Sprintf("&updated_at=%s", updatedAt.UTC().Format(time.RFC3339))
+
+		// Setup multi-part
+		writer := multipart.NewWriter(body)
+		part, err := writer.CreateFormFile("attachment", filename)
+		assert.NoError(t, err)
+		_, err = io.Copy(part, &buff)
+		assert.NoError(t, err)
+		err = writer.Close()
+		assert.NoError(t, err)
+
+		req := NewRequestWithBody(t, "POST", urlStr, body)
+		req.Header.Add("Content-Type", writer.FormDataContentType())
+		resp := session.MakeRequest(t, req, http.StatusCreated)
+
+		apiAttachment := new(api.Attachment)
+		DecodeJSON(t, resp, &apiAttachment)
+
+		// dates will be converted into the same tz, in order to compare them
+		utcTZ, _ := time.LoadLocation("UTC")
+		unittest.AssertExistsAndLoadBean(t, &repo_model.Attachment{ID: apiAttachment.ID, IssueID: issue.ID})
+		assert.Equal(t, updatedAt.In(utcTZ), apiAttachment.Created.In(utcTZ))
+		issueAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: issue.ID})
+		assert.Equal(t, updatedAt.In(utcTZ), issueAfter.UpdatedUnix.AsTime().In(utcTZ))
+	})
+}
+
 func TestAPIEditIssueAttachment(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()
 

tests/integration/api_issue_label_test.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"strings"
 	"testing"
+	"time"
 
 	auth_model "code.gitea.io/gitea/models/auth"
 	issues_model "code.gitea.io/gitea/models/issues"
@@ -15,6 +16,7 @@ import (
 	"code.gitea.io/gitea/models/unittest"
 	user_model "code.gitea.io/gitea/models/user"
 	api "code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/tests"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -111,6 +113,49 @@ func TestAPIAddIssueLabels(t *testing.T) {
 	unittest.AssertExistsAndLoadBean(t, &issues_model.IssueLabel{IssueID: issue.ID, LabelID: 2})
 }
 
+func TestAPIAddIssueLabelsAutoDate(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	issueBefore := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: 3})
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: issueBefore.RepoID})
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})
+
+	session := loginUser(t, owner.Name)
+	token := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeWriteIssue)
+	urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d/labels?token=%s",
+		owner.Name, repo.Name, issueBefore.Index, token)
+
+	t.Run("WithAutoDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequestWithJSON(t, "POST", urlStr, &api.IssueLabelsOption{
+			Labels: []int64{1},
+		})
+		MakeRequest(t, req, http.StatusOK)
+
+		issueAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: issueBefore.ID})
+		// the execution of the API call supposedly lasted less than one minute
+		updatedSince := time.Since(issueAfter.UpdatedUnix.AsTime())
+		assert.LessOrEqual(t, updatedSince, time.Minute)
+	})
+
+	t.Run("WithUpdatedDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		updatedAt := time.Now().Add(-time.Hour).Truncate(time.Second)
+		req := NewRequestWithJSON(t, "POST", urlStr, &api.IssueLabelsOption{
+			Labels:  []int64{2},
+			Updated: &updatedAt,
+		})
+		MakeRequest(t, req, http.StatusOK)
+
+		// dates will be converted into the same tz, in order to compare them
+		utcTZ, _ := time.LoadLocation("UTC")
+		issueAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: issueBefore.ID})
+		assert.Equal(t, updatedAt.In(utcTZ), issueAfter.UpdatedUnix.AsTime().In(utcTZ))
+	})
+}
+
 func TestAPIReplaceIssueLabels(t *testing.T) {
 	assert.NoError(t, unittest.LoadFixtures())
 

tests/integration/api_issue_test.go

@@ -213,6 +213,157 @@ func TestAPIEditIssue(t *testing.T) {
 	assert.Equal(t, title, issueAfter.Title)
 }
 
+func TestAPIEditIssueAutoDate(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	issueBefore := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: 13})
+	repoBefore := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: issueBefore.RepoID})
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repoBefore.OwnerID})
+	assert.NoError(t, issueBefore.LoadAttributes(db.DefaultContext))
+
+	t.Run("WithAutoDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		// User2 is not owner, but can update the 'public' issue with auto date
+		session := loginUser(t, "user2")
+		token := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeWriteIssue)
+		urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d?token=%s", owner.Name, repoBefore.Name, issueBefore.Index, token)
+
+		body := "new content!"
+		req := NewRequestWithJSON(t, "PATCH", urlStr, api.EditIssueOption{
+			Body: &body,
+		})
+		resp := MakeRequest(t, req, http.StatusCreated)
+		var apiIssue api.Issue
+		DecodeJSON(t, resp, &apiIssue)
+
+		// the execution of the API call supposedly lasted less than one minute
+		updatedSince := time.Since(apiIssue.Updated)
+		assert.LessOrEqual(t, updatedSince, time.Minute)
+
+		issueAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: issueBefore.ID})
+		updatedSince = time.Since(issueAfter.UpdatedUnix.AsTime())
+		assert.LessOrEqual(t, updatedSince, time.Minute)
+	})
+
+	t.Run("WithUpdateDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		// User1 is admin, and so can update the issue without auto date
+		session := loginUser(t, "user1")
+		token := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeWriteIssue)
+		urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d?token=%s", owner.Name, repoBefore.Name, issueBefore.Index, token)
+
+		body := "new content, with updated time"
+		updatedAt := time.Now().Add(-time.Hour).Truncate(time.Second)
+		req := NewRequestWithJSON(t, "PATCH", urlStr, api.EditIssueOption{
+			Body:    &body,
+			Updated: &updatedAt,
+		})
+		resp := MakeRequest(t, req, http.StatusCreated)
+		var apiIssue api.Issue
+		DecodeJSON(t, resp, &apiIssue)
+
+		// dates are converted into the same tz, in order to compare them
+		utcTZ, _ := time.LoadLocation("UTC")
+		assert.Equal(t, updatedAt.In(utcTZ), apiIssue.Updated.In(utcTZ))
+
+		issueAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: issueBefore.ID})
+		assert.Equal(t, updatedAt.In(utcTZ), issueAfter.UpdatedUnix.AsTime().In(utcTZ))
+	})
+
+	t.Run("WithoutPermission", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		// User2 is not owner nor admin, and so can't update the issue without auto date
+		session := loginUser(t, "user2")
+		token := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeWriteIssue)
+		urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d?token=%s", owner.Name, repoBefore.Name, issueBefore.Index, token)
+
+		body := "new content, with updated time"
+		updatedAt := time.Now().Add(-time.Hour).Truncate(time.Second)
+		req := NewRequestWithJSON(t, "PATCH", urlStr, api.EditIssueOption{
+			Body:    &body,
+			Updated: &updatedAt,
+		})
+		resp := MakeRequest(t, req, http.StatusForbidden)
+		var apiError api.APIError
+		DecodeJSON(t, resp, &apiError)
+
+		assert.Equal(t, "user needs to have admin or owner right", apiError.Message)
+	})
+}
+
+func TestAPIEditIssueMilestoneAutoDate(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	issueBefore := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: 1})
+	repoBefore := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: issueBefore.RepoID})
+
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repoBefore.OwnerID})
+	assert.NoError(t, issueBefore.LoadAttributes(db.DefaultContext))
+
+	session := loginUser(t, owner.Name)
+	token := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeWriteIssue)
+	urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d?token=%s", owner.Name, repoBefore.Name, issueBefore.Index, token)
+
+	t.Run("WithAutoDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		milestone := int64(1)
+		req := NewRequestWithJSON(t, "PATCH", urlStr, api.EditIssueOption{
+			Milestone: &milestone,
+		})
+		MakeRequest(t, req, http.StatusCreated)
+
+		// the execution of the API call supposedly lasted less than one minute
+		milestoneAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Milestone{ID: milestone})
+		updatedSince := time.Since(milestoneAfter.UpdatedUnix.AsTime())
+		assert.LessOrEqual(t, updatedSince, time.Minute)
+	})
+
+	t.Run("WithPostUpdateDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		// Note: the updated_unix field of the test Milestones is set to NULL
+		// Hence, any date is higher than the Milestone's updated date
+		updatedAt := time.Now().Add(-time.Hour).Truncate(time.Second)
+		milestone := int64(2)
+		req := NewRequestWithJSON(t, "PATCH", urlStr, api.EditIssueOption{
+			Milestone: &milestone,
+			Updated:   &updatedAt,
+		})
+		MakeRequest(t, req, http.StatusCreated)
+
+		// the milestone date should be set to 'updatedAt'
+		// dates are converted into the same tz, in order to compare them
+		utcTZ, _ := time.LoadLocation("UTC")
+		milestoneAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Milestone{ID: milestone})
+		assert.Equal(t, updatedAt.In(utcTZ), milestoneAfter.UpdatedUnix.AsTime().In(utcTZ))
+	})
+
+	t.Run("WithPastUpdateDate", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		// Note: This Milestone's updated_unix has been set to Now() by the first subtest
+		milestone := int64(1)
+		milestoneBefore := unittest.AssertExistsAndLoadBean(t, &issues_model.Milestone{ID: milestone})
+
+		updatedAt := time.Now().Add(-time.Hour).Truncate(time.Second)
+		req := NewRequestWithJSON(t, "PATCH", urlStr, api.EditIssueOption{
+			Milestone: &milestone,
+			Updated:   &updatedAt,
+		})
+		MakeRequest(t, req, http.StatusCreated)
+
+		// the milestone date should not change
+		// dates are converted into the same tz, in order to compare them
+		utcTZ, _ := time.LoadLocation("UTC")
+		milestoneAfter := unittest.AssertExistsAndLoadBean(t, &issues_model.Milestone{ID: milestone})
+		assert.Equal(t, milestoneAfter.UpdatedUnix.AsTime().In(utcTZ), milestoneBefore.UpdatedUnix.AsTime().In(utcTZ))
+	})
+}
+
 func TestAPISearchIssues(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()