0.14.0

Performance

This release is focused on parsing speed via a new two-layer pre-filter pattern: a family-level regex gate followed by cheap byte-level checks within individual parsers, short-circuiting before the heavier regex runs.

New byte pre-filters added:

Parser	Pre-filter	Effect
ymd_hms_z	len < 17 || byte[10] != whitespace	Eliminates bare YYYY-MM-DD dates instantly
ymd_z	len <= 10	Skips inputs that can't have a timezone
month_mdy_hms_z	Scan for isolated 4-digit year	Eliminates inputs like May 27 02:45:27 with no year
month_dmy_hms	!contains(':')	Skips regex entirely for date-only inputs
month_dmy	Trailing 4-digit byte check	Skips the failing %d %B %y parse attempt for 4-digit years

Benchmark improvements vs. 0.13.0 baseline:

Benchmark	Change
parse_all/accepted_formats	−8%
parse_throughput/1000_dates	−6.6%
rfc3339 (2017-11-25T22:34:50Z)	−21%
ymd_hms_z (2019-11-29 08:08:05-08)	−10.5%
month_dmy (1 July 2013)	−11.6%
ymd_z (2021-02-21 PST)	−8.3%
month_mdy_hms (May 8, 2009 5:57:51 PM)	−8%
month_mdy_hms_z (May 02, 2021 15:51 UTC)	−7.9%

No regressions across any format.

Dependencies

• Minimum supported Rust version bumped to 1.93 (was 1.85)
• criterion dev-dependency bumped from 0.5 → 0.8

Internal

• Refactored conditional branches in datetime.rs to use Rust let-chains and is_none_or for cleaner control flow