[ruby-core:88984] [Ruby trunk Bug#11984] DateTime.parse can parse invalid datetime string

Issue #11984 has been updated by long_long_float (kazuki niimi).


Is it a specification? When you pass 'fg4534253dd' to `DateTime#parse`, [`parse_ddd`](https://github.com/ruby/ruby/blob/480a21f435d2917190c087206bbffbd3d532824a/ext/date/date_parse.c#L1894) is called. It doesn't parse from begin of string.
And [document](https://ruby-doc.org/stdlib-2.5.1/libdoc/date/rdoc/DateTime.html#method-c-parse) says `DateTime#parse` is not for validator.

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Bug #11984: DateTime.parse can parse invalid datetime string
https://bugs.ruby-lang.org/issues/11984#change-74013

* Author: lanscene (jarry xu)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.2.4p230 (2015-12-16 revision 53155) [x86_64-linux] and ruby 2.0.0p645 (2015-04-13 revision 50299) [universal.x86_64-darwin15]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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It seems if you pass a string which begins with 2 alphabets and following is 7 numerics, it can be parsed as DateTime, as follows 

irb(main):002:0> require 'time'
irb(main):008:0> dt0 = DateTime.parse('fg4534253dd')
=> #<DateTime: 4534-09-10T00:00:00+00:00 ((3377322j,0s,0n),+0s,2299161j)>
irb(main):009:0> dt0 = DateTime.parse('fg4534253')
=> #<DateTime: 4534-09-10T00:00:00+00:00 ((3377322j,0s,0n),+0s,2299161j)>
irb(main):010:0> DateTime.parse('gg1233234')
=> #<DateTime: 1233-08-22T00:00:00+00:00 ((2171645j,0s,0n),+0s,2299161j)>
irb(main):011:0> DateTime.parse('gg1233234dd')
=> #<DateTime: 1233-08-22T00:00:00+00:00 ((2171645j,0s,0n),+0s,2299161j)>



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