Issue #12297 has been updated by Yukihiro Matsumoto.


According to [ruby-dev:10241] (Japanese), it's intentional.
In Gregorian calendar, the year 0 does not exist, but in astronomical year numbering, the year 0 does exist.

https://en.wikipedia.org/wiki/0_(year)
 
Matz.


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Bug #12297: Ruby stdlib date can parse non-existent date with year 0
https://bugs.ruby-lang.org/issues/12297#change-59663

* Author: t b
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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Ruby date lib can parse date with year 0
`$ pry
[1] pry(main)> shitdate=Date.strptime('0000-01-07','%Y-%m-%d')
=> #<Date: 0000-01-07 ((1721064j,0s,0n),+0s,2299161j)>
[2] pry(main)> shitdate.year
=> 0
[3] pry(main)> ` 

There is no year 0 in gregorian and julian calendar between 1 BC and 1 AD
It should raise ArgumentError like it do when month/day number is 0.

---Files--------------------------------
no_year_0.patch (1.62 KB)


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