I believe the stated expiration for API tests is 1 year, and something to do with the printed lot number gives away the manufacture date.
I believe Salfert all have expiration dates on the box now, I thought it was also 1 year from manufacture
I like API tests, good/cheap/easy/reliable enough for me tests, I only wish someone made a reliable/cheap Mag test
I only seem to use the calcium and Alk test on a regular basis, the others all expire on me before they are gone, so I probably would hold off buying test kits if you are not setting up for a while