サンプル

activesupport 8.1.3.1: Handle ActiveSupport 8.1.3.1 calendar-day arithmetic and nonexistent or ambiguous New York wall times across daylight-saving transitions

検証済みサンプル — gem activesupport 8.1.3.1: Handle ActiveSupport 8.1.3.1 calendar-day arithmetic and nonexistent or ambiguous New York wall times across…

sha256:ebf2e76abb7dfbcfac690de972f1b79c7d172559e807ca037f9fa8099d08c479

MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

宣言された環境 ruby linux x64 ruby ruby bundler

環境	コントラクト	ステージ	実行日
ruby 3 · linux debian/x64 · docker ed25519:d91480838ac982c9	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1	2026-08-17
ruby 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1	2026-08-18

HOW

ゴール: Handle ActiveSupport 8.1.3.1 calendar-day arithmetic and nonexistent or ambiguous New York wall times across daylight-saving transitions
パッケージ: activesupport 8.1.3.1

tzinfo-data 1.2026.3
シンボル: ActiveSupport::VERSION::STRING
ActiveSupport::TimeZone
ActiveSupport::TimeZone#local
ActiveSupport::TimeZone#local_to_utc
ActiveSupport::Duration#since
TZInfo::DataSources::RubyDataSource
環境: ruby
作成日: 2026-08-17T01:13:08Z

assert tzinfo-data selects the bundled Ruby data source so the same IANA rules work without an OS zoneinfo directory
assert adding 1.day across New York spring-forward preserves the local wall-clock hour while spanning only 23 elapsed hours
assert adding 24.hours across the same transition preserves 24 elapsed hours and lands one wall-clock hour later
assert TimeZone#local normalizes the nonexistent 02:30 wall time to 03:30 with the daylight offset
assert TimeZone#local_to_utc rejects that nonexistent wall time with TZInfo::PeriodNotFound
assert the dst flag to TimeZone#local_to_utc selects the two UTC instants for the repeated fall-back 01:30
assert TimeZone#local defaults to the daylight occurrence for the ambiguous fall-back wall time