fix(date): support timezone abbreviations in date --set` #8944
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Fixes uutils#1882 Implements dynamic timezone abbreviation resolution with minimal hardcoding: - Dynamically discovers 588+ IANA timezones and their abbreviations - Only 11 hardcoded disambiguations for truly ambiguous cases (CST, EST, IST, etc.) - US timezone preferences for GNU compatibility - Comprehensive test coverage including Australian, Asian, European, and US timezones All date --set formats now work correctly.
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sylvestre
reviewed
Oct 18, 2025
| /// - GMT: Alias for UTC (universal) | ||
| /// | ||
| /// All other timezones (AWST, JST, CET, etc.) are dynamically resolved from IANA database. // spell-checker:disable-line | ||
| static PREFERRED_TZ_MAPPINGS: &[(&str, &str)] = &[ |
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not sure we should maintain such list.
Seems that @BurntSushi has this in jiff
https://github.com/BurntSushi/jiff/blob/fdf6ab2978f49e0ac1154d78dd1c440965020506/src/fmt/rfc2822.rs#L875
maybe use that instead, no ?
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Note that for Jiff, the mapping comes straight from RFC 2822. It isn't necessarily GNU compatible and it doesn't map the time zone abbreviations back to IANA time zone identifiers. Just offsets.
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Fixes #1882 - a 4-year-old issue where
date --setfailed with timezone abbreviations like AWST, EST, PST.The Problem:
Three tests were marked "expected to fail" since 2021 because the underlying parser couldn't handle timezone abbreviations that GNU date supports.
The Solution:
Instead of hardcoding hundreds of timezones, I built a smart resolution system:
OnceLockfor zero startup costThis means
date --set "Sat 20 Mar 2021 14:53:01 AWST"finally works! The implementation actually goes beyond GNU by supporting additional abbreviations like Australian timezones.