Most good kimchi contains no or very little vinegar, I buy Tobagi. Store bought kimchi here is miles apart from homemade in Korea, the level of fermentation is much less. I never concern myself with use by dates, when I make a buy I load up. The same applies to sauerkraut---it doesn't get bad, it gets better!
"A pessimist sees the difficulty in every opportunity, an optimist sees the opportunity in every difficulty” ---Sir Winston Churchill
"Political extremism involves two prime ingredients: an excessively simple diagnosis of the world's ills, and a conviction that there are identifiable villains back of it all." ---John W. Gardner
“You can’t go back and change the beginning, but you can start where you are and change the ending.” ---C. S. Lewis