Issue #11984 has been reported by jarry xu.

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

* Author: jarry xu
* Status: Open
* Priority: Normal
* Assignee: 
* 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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