Rust port of upstream tzcode localtime.c runtime semantics — TZif → local civil time, verified field-for-field against a compiled localtime.c oracle. Not a libc replacement.

Faithful Rust port of IANA tzdb checktab.awk — zone.tab / zone1970.tab / zonenow.tab consistency checker

Faithful, memory-safe Rust port of upstream tzcode date.c — the small standalone 'tzdate' utility. Verified against the compiled tzcode oracle. Not a date/time library.

Faithful Rust port of IANA tzdb checknow.awk — zonenow.tab consistency checker (now-through-28-years zdump verification)

Small, unsafe-free Rust port of upstream tzcode asctime.c — the legacy fixed-format time formatter, verified byte-for-byte against a compiled asctime.c oracle. Not a libc/general formatter.

Rust port of upstream tzcode strftime.c formatting semantics (C/C.UTF-8 locale) — formats an explicit tm, verified field-for-field against a compiled strftime.c oracle. Not a libc/locale formatter.

A faithful Rust port of upstream ziguard.awk — the IANA tzdb source-profile transformer that converts the tz source files into main, vanguard, and rearguard form.

A faithful Rust port of upstream zishrink.awk — the IANA tzdb source compactor that converts a profile (main.zi, the output of ziguard.awk) into the small distributed tzdata.zi. zic treats the shrunk output as identical to its input.

Integration + upstream-archaeology court for the Rust-native tz suite: maps the eggert/tz surface to 14 published crates and proves full coverage.

Faithful Rust port of IANA tzdb checklinks.awk — Zone/Link graph consistency checker (link-to-nowhere, link-to-link, name collisions, backward backcheck)

Memory-safe Rust port of upstream tzcode difftime.c — time_t difference arithmetic, verified bit-for-bit against the compiled C oracle.