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It does expire.
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I used resin that had expired for a whole year.
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If it doesn't print/cure properly it is "expired". Shouldn't cause any serious harm to the printer or additional safety hazard. So just go for it.
this post was submitted on 01 Feb 2025
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It should be fine if it was completely sealed and not exposed to light. Worse case I would just expect it to have hardened.
It sloshes around real nice when shaken.
Make sure you shake it insanely well before opening.
The black plastic tubes don't block 100% UV so place it in a dark corner of a room.
Besides light, temperature can also cause degradation.
Oxygen might as well slowly oxidize the photosensitive catalyst.
Allegedly the UV reactive stuff can break down, so it may not cure properly.