[ruby-core:106458] [Ruby master Feature#18033] Time.new to parse a string

Issue #18033 has been updated by nobu (Nobuyoshi Nakada).


Eregon (Benoit Daloze) wrote in #note-17:
> Hence, why not make `Time.iso8601` fast and a core method?
> Then code already using the right method would just become faster, and there is no need migrate code to use a new API.

First, the primary target is the result of `Time#inspect`, and it is not fully compliant with ISO-8601.
Second, ISO-8601 allows many variants, but I'm not going to implement them all.

----------------------------------------
Feature #18033: Time.new to parse a string
https://bugs.ruby-lang.org/issues/18033#change-95115

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
----------------------------------------
Make `Time.new` parse `Time#inspect` and ISO-8601 like strings.

* `Time.iso8601` and `Time.parse` need an extension library, `date`.
* `Time.iso8601` can't parse `Time#inspect` string.
* `Time.parse` often results in unintentional/surprising results.
* `Time.new` also about 1.9 times faster than `Time.iso8601`.

    ```
    $ ./ruby -rtime -rbenchmark -e '
    n = 1000
    s = Time.now.iso8601
    Benchmark.bm(12) do |x|
      x.report("Time.iso8601") {n.times{Time.iso8601(s)}}
      x.report("Time.parse") {n.times{Time.parse(s)}}
      x.report("Time.new") {n.times{Time.new(s)}}
    end'
                       user     system      total        real
    Time.iso8601   0.006919   0.000185   0.007104 (  0.007091)
    Time.parse     0.018338   0.000207   0.018545 (  0.018590)
    Time.new       0.003671   0.000069   0.003740 (  0.003741)
    ```

https://github.com/ruby/ruby/pull/4639



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