[ruby-core:114165] [Ruby master Bug#19293] The new Time.new(String) API is nice... but we still need a stricter version of this

Issue #19293 has been updated by mame (Yusuke Endoh).


Discussed at the dev meeting. The conclusion is:

* Fix it in master (towards Ruby 3.3)
* @nagachika will decide whether to backport to 3.2.3 or not.

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Bug #19293: The new Time.new(String) API is nice... but we still need a stricter version of this
https://bugs.ruby-lang.org/issues/19293#change-103849

* Author: matsuda (Akira Matsuda)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.3.0dev (2023-01-01T07:39:00Z master 542e984d82) +YJIT [arm64-darwin21]
* Backport: 3.0: DONTNEED, 3.1: DONTNEED, 3.2: REQUIRED
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The Ruby 3.2 style `Time.new(String)` API works very well so far, but since the original `Time.new(Integer, Integer, Integer...)` API actually accepts String objects as its arguments, there's one ambiguous case as follows:
`Time.new('20230123')  #=> 20230123-01-01 00:00:00 +0900`

Then the problem that I'm facing is that we cannot tell if `Time.new` would parse the given String as ISO8601-ish or just a year, and in order to avoid this ambiguity, we still need to somehow parse the String beforehand in our application side (like we're doing this way in Ruby on Rails https://github.com/rails/rails/blob/c49b8270/activemodel/lib/active_model/type/helpers/time_value.rb#L64-L70), then dispatch to the new `Time.new` only when the String is validated to be conforming the ISO format. Otherwise, if we just optimistically pass in given Strings to `Time.new`, we'll occasionally get a Time object with an unintended buggy value.

Therefore, it unfortunately seems that my feature request on #16005 still continues... I have to keep proposing that we need either of the following:

1. A trustworthy version of ISO8601 parser method perhaps with another name than `.new` that accepts strict ISO8601-ish String only (but with the T delimiter, I still don't know what the proper name of this format is).

2. Change `Time.new(Integer-ish, Integer-ish, Integer-ish...)` not to accept Integer-ish Strings but to accept only Integers. But I can imagine that this direction is very unlikely acceptable, due to the incompatibility.

---Files--------------------------------
time_benchmark.rb (1.24 KB)


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