The way deadlines are implemented is basically by changing when each “day” begins / ends. I’ve complained about this in a different context, namely how “^” is interpreted in advanced data entry. I agree, it’s confusing, but I think it’s pretty baked in and is unlikely to be changed unless there’s a more radical conceptual revamp (e.g. Continuous Beeminding). You’re probably better off adjusting your workflow to not depend on this so much.
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