Mark de Wever b9f3d241f4 [libc++][format] Fixes times before epoch.
The number of days should be rounded down, for both positive and
negative times since epoch. The original code truncated, which is
correct for positive values, but wrong for negative values.

Depends on D138826

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D154865
2023-07-18 21:17:11 +02:00
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