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Pieter ViljoenandClaude Opus 5.5
9b68b7e1ae
ZephCore writes the year as two BCD digits with no century, as y % 100. A time before 2000, accepted by a node whose clock had no time yet, was stored as a year near the end of the century and restored at the next boot above the 2025 floor: `time 900000000` (1998) came back as 2098. rtc_time_block() now fails outside 2000-2099, and zephcore_rtc_save() then logs and writes no time, for every chip; the chip keeps the time it has. An RV3028 write retry stops if its run-on time leaves the range. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>