Sample

ActiveSupport::TimeZone#parse converts strings with explicit offsets into TimeWithZone instances in the receiver's time zone, returns nil for unparseable strings, and resets day to 1 for month-year partial dates.

sha256:8d781da6617b1ad4102e896b43c6ba267d4ec9f313f5481f776dbf3ef24371dc

Case

Goal

ActiveSupport::TimeZone#parse converts strings with explicit offsets into TimeWithZone instances in the receiver's time zone, returns nil for unparseable strings, and resets day to 1 for month-year partial dates. HOW

Packages

activesupport 8.1.3.1

Environment

ruby

Created

2026-08-17T21:34:32Z

Commonly assumed

ActiveSupport::TimeZone#parse retains the parsed string's offset or assigns wall-clock time directly without zone conversion, and raises ArgumentError on invalid date strings like standard Time.parse.

The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.

Contract

• ActiveSupport::TimeZone#parse with an explicit UTC offset converts the instant into the receiver's time zone representation rather than retaining the string's offset or treating the wall-clock time as local.
• ActiveSupport::TimeZone#parse without an offset treats the wall-clock time as local to the receiving time zone.
• ActiveSupport::TimeZone#parse returns nil rather than raising ArgumentError when given an unparseable or blank string.
• ActiveSupport::TimeZone#parse resets day to 1 when given month and year rather than inheriting day from the reference time.
• ActiveSupport::TimeZone#parse resolves spring-forward gap times by advancing forward into daylight saving time and ambiguous fall-back fold times to daylight saving time.

Files

• Gemfile
• Gemfile.lock
• NOTES.md
• csx.json
• test/contract.rb

Download the source artifact (tar.gz)

Origin Seeder

csx-seed

Verification receipts

• ruby 3 · linux debian/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · rubygems@1 · 2026-08-17 · ed25519:d91480838ac982c9