Julian year 4713 BC is -4712, because year 0 = 1 BC #1536
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Companion PR to (currently unmerged) swiftlang/swift-corelibs-foundation#5274
This is a minor comment-only fix. The minimum of the range (
-211845067200.0) does indeed represent Julian day 0 (proleptic Gregorian-4713-11-24 12:00:00 +0000= November 24, 4714 BC), but it is documented incorrectly as proleptic Julian-4713-01-01 12:00:00 +0000which is 4714 BC instead of the correct year -4712 = 4713 BC