This is true, but if it is documented it is still sufficiently oddball to be useless. Consider: Midnight UTC, timezone EST: True Midnight UTC, timezo

This is true, but if it is documented it is still sufficiently oddball to be useless. Consider: Midnight UTC, timezone EST: True Midnight UTC, timezone CET: False Midnight UTC, timezone CST: True Midnight UTC, timezone WIT: False Midnight UTC, timezone PST: True Now the problem here is that it may well be documented but it is in fact unsafe to rely on in any context. The behavior is thus irretrievably broken, documented or not. It isn't even expert-friendly. The behavior, documented or not, is irretrievably broken. After all timezones west of GMT will never have false times. If there is a use case for this behavior, I sure can't see it. Unless you like bugs appearing when you change timezones.