Hi Sushila,
suser_sname() prints the same user as user_name().
Here is my trigger:
CREATE TRIGGER [track_time] ON dbo.ATTENDEES
FOR UPDATE
AS
UPDATE ATTENDEES
SET timestamp1=GETDATE(), User_name1 =suser_sname()
FROM ATTENDEES
JOIN deleted ON ATTENDEES.FTKey=deleted.FTkey
AND ATTENDEES.Day1<>deleted.Day1