llvm-project

83ca6fc7 - [libc] Fix gmtime and mktime for years before zero (#236515)

[libc] Fix gmtime and mktime for years before zero (#236515) yrs % 4 is negative for a year before zero, which moved the month out of range and aborted on the assertion that follows. Mask the low two bits instead, which is the non-negative remainder Add the year before zero and year zero to the gmtime test AI disclosure: this patch was written with Claude Code. I reviewed the change and ran the new test; it fails without the fix and passes with it Assisted-by: Claude