[ruby-core:75866] [Ruby trunk Bug#12297] Ruby stdlib date can parse non-existent date with year 0

Issue #12297 has been updated by Noah Gibbs.


Ah! It would be hard to "fix" Ruby's stdlib to not allow dates to have a 0 year in general, because of code like the Date test that can use a Date as a delta. That is:

    class DateSub < Date; end

    d2 = d - 1
    assert_instance_of(DateSub, d2)

Things like DateSub can clearly have a 0 year, because that implies that the *difference* in years is 0, not that it's the year 0.

I think it still makes sense to fix strptime with the fix above. But I don't think Date or DateTime should disallow the year 0 in general.


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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-59038

* 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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