[youdie006]

#334 let abbreviated weekday names take a trailing dot (mon.), but literal_month still parses only alpha1, so a dotted month abbreviation is rejected. The module doc of date.rs quotes the GNU manual: months "may be abbreviated to their first three letters, possibly followed by an abbreviating dot".

input           GNU date 9.4 (TZ=UTC)   before   after
jan. 5 2024     2024-01-05 00:00:00     error    2024-01-05 00:00:00
nov.-14-2022    2022-11-14 00:00:00     error    2022-11-14 00:00:00
dec.25          2026-12-25 00:00:00     error    2026-12-25 00:00:00
sept. 5 2024    invalid date            error    error
june. 5 2024    invalid date            error    error

This uses the same parser shape as #334 ((alpha1, opt('.')).take()) and adds the dotted three-letter forms to the match, so sept., june. and january. stay rejected like in GNU date. The grammar comment in items/mod.rs is updated to match.

Tests: dotted rows in the literal1/literal2/literal3 tests and month_abbreviation_with_period in lib.rs (all twelve months, plus the rejected forms); they fail without the change. cargo test, cargo fmt --all -- --check and cargo clippy --all-targets -- -D warnings pass locally. GNU behaviour was checked only by running date, not by reading its source.

Written with AI assistance (Claude); I have reviewed the change.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.90%. Comparing base (37d5d78) to head (3147b94).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #347   +/-   ##
=======================================
  Coverage   98.90%   98.90%           
=======================================
  Files          21       21           
  Lines        4546     4564   +18     
  Branches      142      142           
=======================================
+ Hits         4496     4514   +18     
  Misses         49       49           
  Partials        1        1           

Flag	Coverage Δ
macos_latest	98.90% <100.00%> (+<0.01%)	⬆️
ubuntu_latest	98.90% <100.00%> (+<0.01%)	⬆️
windows_latest	12.13% <3.22%> (-0.05%)	⬇️

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