diff --git a/clientapi/routing/sendevent.go b/clientapi/routing/sendevent.go
index 44e82aed08..af638951d2 100644
--- a/clientapi/routing/sendevent.go
+++ b/clientapi/routing/sendevent.go
@@ -158,7 +158,35 @@ func SendEvent(
 		}
 	}
 
-	evTime, err := httputil.ParseTSParam(req)
+
+	// HandleEventTimestamp processes the ts parameter based on whether the request is from an appservice.
+	func HandleEventTimestamp(req *http.Request) (time.Time, error) {
+    	if isAppService(req) {
+        	evTime, err := httputil.ParseTSParam(req)
+        	if err != nil {
+            	return time.Time{}, err // Return error for further handling
+        	}
+        	return evTime, nil
+    	}
+
+    	// If not from an appservice, use the current time or other default handling
+    	return time.Now(), nil
+	}
+
+	// Check if the request is from an appservice
+	func isAppService(req *http.Request) error {
+		evTime, err := HandleEventTimestamp(req)
+		if err != nil {
+			// Handle error, e.g., return a 400 Bad Request
+			return httputil.LogThenError(req, err)
+		}
+	
+		// Use evTime for the event timestamp
+		// Proceed with your original logic...
+	
+		return nil
+	}
+
 	if err != nil {
 		return util.JSONResponse{
 			Code: http.StatusBadRequest,
@@ -291,6 +319,26 @@ func updatePowerLevels(req *http.Request, r map[string]interface{}, roomID strin
 	return nil
 }
 
+//If appservices use a specific access token, you can check the request’s authorization header for this token.
+func isAppService(req *http.Request) bool {
+    // Check if the request contains an access token for appservices
+    accessToken := req.Header.Get("Authorization")
+    
+    // This is an example; you need to replace it with your appservice token checking logic
+    if strings.HasPrefix(accessToken, "Bearer") {
+        token := strings.TrimPrefix(accessToken, "Bearer ")
+        return isValidAppServiceToken(token)
+    }
+    
+    return false
+}
+
+func isValidAppServiceToken(token string) bool {
+    // Placeholder function: implement logic to validate if the token belongs to an appservice
+    // For example, you could compare against a list of known appservice tokens
+    return token == "your_appservice_token"
+}
+
 // stateEqual compares the new and the existing state event content. If they are equal, returns a *util.JSONResponse
 // with the existing event_id, making this an idempotent request.
 func stateEqual(ctx context.Context, rsAPI api.ClientRoomserverAPI, eventType, stateKey, roomID string, newContent map[string]interface{}) *util.JSONResponse {
diff --git a/test/ts_param_test.go b/test/ts_param_test.go
new file mode 100644
index 0000000000..95aa60fc60
--- /dev/null
+++ b/test/ts_param_test.go
@@ -0,0 +1,59 @@
+// ts_param_test.go
+package testing
+
+import (
+    "net/http"
+    "net/http/httptest"
+    "testing"
+    "time"
+    "your_project_path/routing"  // Adjust this import path
+)
+
+func createRequestWithTS(ts string, isAppService bool) *http.Request {
+    req := httptest.NewRequest("POST", "/_matrix/client/r0/rooms/!roomid:domain/send/m.room.message", nil)
+    q := req.URL.Query()
+    if ts != "" {
+        q.Add("ts", ts)
+    }
+    req.URL.RawQuery = q.Encode()
+
+    if isAppService {
+        req.Header.Set("Authorization", "Bearer your_appservice_token")
+    } else {
+        req.Header.Set("Authorization", "Bearer regular_user_token")
+    }
+    return req
+}
+
+func TestHandleEventTimestamp_ValidAppService(t *testing.T) {
+    req := createRequestWithTS("1657890000000", true)
+    evTime, err := routing.HandleEventTimestamp(req)
+    if err != nil {
+        t.Fatalf("Expected no error, got %v", err)
+    }
+
+    expectedTime := time.Unix(1657890000, 0)
+    if !evTime.Equal(expectedTime) {
+        t.Errorf("Expected time %v, got %v", expectedTime, evTime)
+    }
+}
+
+func TestHandleEventTimestamp_InvalidTS(t *testing.T) {
+    req := createRequestWithTS("invalid_ts", true)
+    _, err := routing.HandleEventTimestamp(req)
+    if err == nil {
+        t.Fatal("Expected an error, got none")
+    }
+}
+
+func TestHandleEventTimestamp_NonAppService(t *testing.T) {
+    req := createRequestWithTS("1657890000000", false)
+    evTime, err := routing.HandleEventTimestamp(req)
+    if err != nil {
+        t.Fatalf("Expected no error, got %v", err)
+    }
+
+    if time.Now().Sub(evTime) > time.Second {
+        t.Errorf("Expected current time, got %v", evTime)
+    }
+}