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    This is a somewhat complicated topic due to the site rules, so I added a post notice. To elaborate: If the milk was opened at the beginning of that month (or unopened but past its use-by) it was unsafe by official definitions, so we have to treat your question as based on a false assumption. That is, we can accept answers which reiterate that "spoiled" and "unsafe" are not the same thing. But if there are answers which claim to give advice how to replicate the situation, claiming that it was safe, they will have to be removed.
    – rumtscho ♦
    Commented Jun 8, 2021 at 17:49
  • I been in Moscow recently and notices something similar. I bought 1liter milk in paper box and used it a little bit and forgot to put it inside the fridge. After more than one month I came back to same house and thought that the milk must be spoiled, but it wasn't, no bad smell. After discussing it with my friends, I found out that better buy milk in plastic bottle, I try to experiment with it also, they got spoiled quite fast, which I think is good. The expiry date of a milk in paper box was 1 year, while in plastic bottle was 1 week.
    – Lee
    Commented Jun 9, 2021 at 6:18
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    Could it have been filtered milk? In the uk filtered milk is packaged in opaque plastic. Filtered milk keeps fresh much much longer (but still must be refrigerated, unlike uht milk)
    – Richard Tingle
    Commented Jun 9, 2021 at 6:59