diff --git a/models/issue_tracked_time.go b/models/issue_tracked_time.go
index b84adbc59..55e8baacd 100644
--- a/models/issue_tracked_time.go
+++ b/models/issue_tracked_time.go
@@ -8,7 +8,6 @@ import (
 	"time"
 
 	"code.gitea.io/gitea/modules/setting"
-	api "code.gitea.io/gitea/modules/structs"
 
 	"xorm.io/builder"
 	"xorm.io/xorm"
@@ -60,25 +59,6 @@ func (t *TrackedTime) loadAttributes(e Engine) (err error) {
 	return
 }
 
-// APIFormat converts TrackedTime to API format
-func (t *TrackedTime) APIFormat() (apiT *api.TrackedTime) {
-	apiT = &api.TrackedTime{
-		ID:       t.ID,
-		IssueID:  t.IssueID,
-		UserID:   t.UserID,
-		UserName: t.User.Name,
-		Time:     t.Time,
-		Created:  t.Created,
-	}
-	if t.Issue != nil {
-		apiT.Issue = t.Issue.APIFormat()
-	}
-	if t.User != nil {
-		apiT.UserName = t.User.Name
-	}
-	return
-}
-
 // LoadAttributes load Issue, User
 func (tl TrackedTimeList) LoadAttributes() (err error) {
 	for _, t := range tl {
@@ -89,15 +69,6 @@ func (tl TrackedTimeList) LoadAttributes() (err error) {
 	return
 }
 
-// APIFormat converts TrackedTimeList to API format
-func (tl TrackedTimeList) APIFormat() api.TrackedTimeList {
-	result := make([]*api.TrackedTime, 0, len(tl))
-	for _, t := range tl {
-		result = append(result, t.APIFormat())
-	}
-	return result
-}
-
 // FindTrackedTimesOptions represent the filters for tracked times. If an ID is 0 it will be ignored.
 type FindTrackedTimesOptions struct {
 	IssueID           int64
diff --git a/modules/convert/issue.go b/modules/convert/issue.go
new file mode 100644
index 000000000..d88a742db
--- /dev/null
+++ b/modules/convert/issue.go
@@ -0,0 +1,38 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package convert
+
+import (
+	"code.gitea.io/gitea/models"
+	api "code.gitea.io/gitea/modules/structs"
+)
+
+// ToTrackedTime converts TrackedTime to API format
+func ToTrackedTime(t *models.TrackedTime) (apiT *api.TrackedTime) {
+	apiT = &api.TrackedTime{
+		ID:       t.ID,
+		IssueID:  t.IssueID,
+		UserID:   t.UserID,
+		UserName: t.User.Name,
+		Time:     t.Time,
+		Created:  t.Created,
+	}
+	if t.Issue != nil {
+		apiT.Issue = t.Issue.APIFormat()
+	}
+	if t.User != nil {
+		apiT.UserName = t.User.Name
+	}
+	return
+}
+
+// ToTrackedTimeList converts TrackedTimeList to API format
+func ToTrackedTimeList(tl models.TrackedTimeList) api.TrackedTimeList {
+	result := make([]*api.TrackedTime, 0, len(tl))
+	for _, t := range tl {
+		result = append(result, ToTrackedTime(t))
+	}
+	return result
+}
diff --git a/routers/api/v1/repo/issue_tracked_time.go b/routers/api/v1/repo/issue_tracked_time.go
index dd959192c..323bf67d8 100644
--- a/routers/api/v1/repo/issue_tracked_time.go
+++ b/routers/api/v1/repo/issue_tracked_time.go
@@ -12,6 +12,7 @@ import (
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/convert"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/routers/api/v1/utils"
 )
@@ -93,7 +94,7 @@ func ListTrackedTimes(ctx *context.APIContext) {
 		ctx.Error(http.StatusInternalServerError, "LoadAttributes", err)
 		return
 	}
-	ctx.JSON(http.StatusOK, trackedTimes.APIFormat())
+	ctx.JSON(http.StatusOK, convert.ToTrackedTimeList(trackedTimes))
 }
 
 // AddTime add time manual to the given issue
@@ -178,7 +179,7 @@ func AddTime(ctx *context.APIContext, form api.AddTimeOption) {
 		ctx.Error(http.StatusInternalServerError, "LoadAttributes", err)
 		return
 	}
-	ctx.JSON(http.StatusOK, trackedTime.APIFormat())
+	ctx.JSON(http.StatusOK, convert.ToTrackedTime(trackedTime))
 }
 
 // ResetIssueTime reset time manual to the given issue
@@ -399,7 +400,7 @@ func ListTrackedTimesByUser(ctx *context.APIContext) {
 		ctx.Error(http.StatusInternalServerError, "LoadAttributes", err)
 		return
 	}
-	ctx.JSON(http.StatusOK, trackedTimes.APIFormat())
+	ctx.JSON(http.StatusOK, convert.ToTrackedTimeList(trackedTimes))
 }
 
 // ListTrackedTimesByRepository lists all tracked times of the repository
@@ -486,7 +487,7 @@ func ListTrackedTimesByRepository(ctx *context.APIContext) {
 		ctx.Error(http.StatusInternalServerError, "LoadAttributes", err)
 		return
 	}
-	ctx.JSON(http.StatusOK, trackedTimes.APIFormat())
+	ctx.JSON(http.StatusOK, convert.ToTrackedTimeList(trackedTimes))
 }
 
 // ListMyTrackedTimes lists all tracked times of the current user
@@ -530,5 +531,5 @@ func ListMyTrackedTimes(ctx *context.APIContext) {
 		return
 	}
 
-	ctx.JSON(http.StatusOK, trackedTimes.APIFormat())
+	ctx.JSON(http.StatusOK, convert.ToTrackedTimeList(trackedTimes))
 }