diff --git a/backend/internal/http/router/handlers-web.go b/backend/internal/http/router/handlers-web.go
index b2ee5279a..1669d2e22 100644
--- a/backend/internal/http/router/handlers-web.go
+++ b/backend/internal/http/router/handlers-web.go
@@ -63,6 +63,9 @@ func (e *Router) readBody(w http.ResponseWriter, r *http.Request, limit int64) (
 
 func getSessionTimestamp(req *StartSessionRequest, startTimeMili int64) (ts uint64) {
 	ts = uint64(req.Timestamp)
+	if req.IsOffline {
+		return
+	}
 	c, err := semver.NewConstraint(">=4.1.6")
 	if err != nil {
 		return
@@ -78,7 +81,7 @@ func getSessionTimestamp(req *StartSessionRequest, startTimeMili int64) (ts uint
 	}
 	if c.Check(v) {
 		ts = uint64(startTimeMili)
-		if req.BufferDiff > 0 && req.BufferDiff < 3*60*1000 {
+		if req.BufferDiff > 0 && req.BufferDiff < 5*60*1000 {
 			ts -= req.BufferDiff
 		}
 	}
diff --git a/backend/internal/http/router/model.go b/backend/internal/http/router/model.go
index 37fa2ff9a..df6ca3797 100644
--- a/backend/internal/http/router/model.go
+++ b/backend/internal/http/router/model.go
@@ -15,6 +15,7 @@ type StartSessionRequest struct {
 	UserID          string  `json:"userID"`
 	DoNotRecord     bool    `json:"doNotRecord"` // start record session or not
 	BufferDiff      uint64  `json:"bufferDiff"`  // buffer diff in ms for start record session
+	IsOffline       bool    `json:"isOffline"`   // to indicate that we have to use user's start timestamp
 }
 
 type StartSessionResponse struct {