[llvm-bugs] [Bug 123778] I don't think this test is quite right. But since we don't have any historical practice with negative leap seconds, my reasoning is based on an assumption: the IANA db contains the earliest time after a leap second is fully inserted. I'm basing this on the fact that positive leap seconds are inserted at 11:59:60 PM on 30 June/31 December, but the db contains 12:00:00 AM on 1 July/1 January.

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