And the answer is always: yes it's probably fine but it may not be ok to use expired yeast. Liquid malt extract and hops lasts years and years. Yeast however is a living organism. There is always a 'best before' date on a packet of yeast, but even if that date is passed, it doesn't mean you can't use it.
Yes, heat actually causes beer to go bad more quickly than if it's refrigerated or stored in a cool cellar. As a rule of thumb, you should approach beer storage using the 3-30-300 rule. This rule states that you can keep beer at 90°F for only 3 days before it goes bad. It will last 30 days at 72°F, which is around room temperature.
You can assume a production date of 4 months prior, so November 3rd. Plug that date into your favorite yeast calculator and it will tell you the percent viability. Looks like you made a starter, so assuming you're good to go.
Check Date Codes Immediately. Just like when you check a box of salad or a gallon of milk for a “best by” date, you should be checking your beers for these dates before buying at stores and We bought beers that were on the shelf, whatever the best-before date, to replicate what is generally available to the consumer at any one point in time. Locally brewed vs imported If you like the taste of European beer but don't like the idea of a globetrotting brew, you should have no hesitation about purchasing a beer brewed locally under 9gcJK.
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  • best before dates on beer