From: "fitmap (Justin Peal) via ruby-core" <ruby-core@...>
Date: 2025-03-27T09:22:41+00:00
Subject: [ruby-core:121448] [Ruby Bug#21199] Psych.dump and load on Date before 1582-10-15

Issue #21199 has been reported by fitmap (Justin Peal).

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Bug #21199: Psych.dump and load on Date before 1582-10-15
https://bugs.ruby-lang.org/issues/21199

* Author: fitmap (Justin Peal)
* Status: Open
* ruby -v: ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x64-mingw-ucrt]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
The code is:

require 'date'
require 'psych'

date = Date.new(1582, 10, 4)
p "date=#{date.inspect}"
str = Psych.dump(date, permitted_classes: [Date])
p "str=#{str}"
date2 = Psych.load(str, permitted_classes: [Date])
p "date2=#{date2.inspect}"

The output is:

"date=#<Date: 1582-10-04 ((2299160j,0s,0n),+0s,2299161j)>"
"str=--- 1582-10-14\n"
"date2=#<Date: 1582-10-14 ((2299160j,0s,0n),+0s,-Infj)>"




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