How long does coconut milk last?
Unopened, it keeps in the cupboard for about 18 months. Once opened, in the fridge for about 3 days.
This refers to: Canned coconut milk.

Shelf life of coconut milk at a glance
| Storage | Unopened | Opened |
|---|---|---|
| Cupboard | 18 months | – |
| Fridge | – | 3 days |
Store unopened cans cool and dry, and do not freeze them. Transfer leftovers to a container and keep 3 days in the fridge, or freeze in portions.
Past its date does not mean spoiled
These are guide values for food stored correctly. A best-before date is not a throw-away date: many products are still fine after it. Check how it looks, smells and tastes. Mould, an unusual smell or a bulging can are reasons to throw it away. A use-by date is different: do not eat the food after it.