edtf-core 1.1.0

EDTF (ISO 8601-2:2019 Annex A) parsing, validation, bounds, temporal relations and canonical formatting, levels 0-2. no_std, zero dependencies.
Documentation

edtf-core

A complete, spec-exact Rust implementation of EDTF — the Extended Date/Time Format, standardized as the profile in ISO 8601-2:2019 Annex A — covering conformance levels 0, 1 and 2 in full. #![no_std], zero runtime dependencies.

  • Parsing and validation with positioned errors — 1985-02-30 is rejected, 2000-02-29 is accepted and 1900-02-29 is not, 1985-02-3X is rejected because no February day starts with 3.
  • Level classification (minimum conformance level of an expression).
  • Calendar bounds: every expression maps to earliest/latest calendar days (156X → 1560-01-01…1569-12-31), the primitive for range queries.
  • Three-valued temporal relations under uncertainty — is 1985~ before 199X? Definitely. Is 198X before 1985? Possibly.
  • Canonical (spec-preferred) formatting.
  • Optional serde feature for the model types.
use edtf_core::Edtf;

let d: Edtf = "1985-04-XX".parse()?;
assert_eq!(d.to_string(), "1985-04-XX");
# Ok::<(), edtf_core::Error>(())

This is the core of a small family — CLI (edtf-cli), WebAssembly/npm (edtf-wasm), Postgres extension (edtf-postgres) and Julian-calendar ingest conversion (edtf-calendars) — all compiled from this one implementation, so a date that is valid in your application is valid in your database. Full documentation, the spec-coverage notes and the whole family live in the repository.

License

MIT OR Apache-2.0, at your option.