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Hui Su
339bffb702
The original overflow logic used __spm[tm_mon] as the current month's length when normalizing tm_mday. This produced incorrect dates after crossing month boundaries and left zero or negative days unnormalized. Use the difference between adjacent cumulative day offsets with leap-year handling. Normalize overflow in tm_sec, tm_min, tm_hour, tm_mday, and tm_mon to keep the affected broken-down fields normalized. Add regression tests for month boundaries, leap years, large offsets, zero and negative days, negative time fields, combined overflow, and boundary carry cases. Close #11686 Signed-off-by: Hui Su <3164683437@qq.com>