nx_ts.nx

nx_ts.nx -- Unix epoch <-> calendar / ISO-8601 conversion. nx_log writes timestamps as raw seconds-since-epoch. That's machine-readable but not human-readable: you can't tell at a glance whether a log line was 2 minutes ago or 2 weeks ago. This module provides: - epoch -> (year, month, day, hour, min, sec) calendar tuple using the Howard Hinnant civil-from-days algorithm (no lookup tables, no floating point, exact). - calendar -> ISO-8601 string formatter ("2026-04-25T03:14:07Z") Reference: Hinnant, "chrono-Compatible Low-Level Date Algorithms", http://howardhinnant.github.io/date_algorithms.html Pairs with nx_log + nx_strfmt. No timezone handling -- we always emit UTC ('Z' suffix). TZ awareness can come later if anyone actually needs it.