Ruby 1.87 与 1.92 Date.parse
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Ruby 1.87 vs 1.92 Date.parse
提问by mgm8870
In Ruby 1.87 I could do:
在 Ruby 1.87 中，我可以这样做：
Date.parse ("3/21/2011")
Now in 1.9.2 I get:
现在在 1.9.2 我得到：
ArgumentError: invalid date
参数错误：无效日期
Any ideas?
有任何想法吗？
回答by Jon Gauthier
Use strptimeand give a specific time format.
使用strptime并给出特定的时间格式。
ruby-1.9.2-p136 :022 > Date.strptime '03/21/2011', '%m/%d/%Y'
=> #<Date: 2011-03-21 (4911283/2,0,2299161)>
See michaelmichael's responsefor the reason for this difference between Ruby versions.
有关Ruby 版本之间存在差异的原因，请参阅michaelmichael的回复。
回答by michaelmichael
Per this bug report, the ability to parse mm/dd/yydates was intentionally removed in 1.9. Ruby's creator, Yukihiro Matsumoto says:
根据这个错误报告，解析mm/dd/yy日期的能力在 1.9 中被有意删除。Ruby 的创造者 Yukihiro Matsumoto 说：
"dd/dd/dd" format itself is very culture dependent and ambiguous. It is yy/mm/dd in Japan (and other countries), mm/dd/yy in USA, dd/mm/yy in European countries, right? In some cases, you can tell them by accident, but we should not rely on luck in general cases. I believe that is the reason parsing this format is disabled in 1.9.
“dd/dd/dd”格式本身非常依赖于文化并且模棱两可。日本（和其他国家）是 yy/mm/dd，美国是 mm/dd/yy，欧洲国家是 dd/mm/yy，对吧？在某些情况下，您可以偶然告诉他们，但在一般情况下，我们不应依靠运气。我相信这就是解析这种格式在 1.9 中被禁用的原因。
As hansengel suggests, you can use Date.strptimeinstead.
正如 hansengel 所建议的，您可以Date.strptime改用。
回答by John F. Miller
I have always had difficulty parsing dates with Date.parse. My solution is gratutious of the chronicgem. I also like the strptimefunction found in another answer.
我总是很难用Date.parse. 我的解决方案是免费的chronicgem。我也喜欢strptime在另一个答案中找到的功能。
回答by Tom Rossi
I like the american_dategem for accomplishing this...
我喜欢american_dategem 来完成这个......
回答by grosser
class << self
def parse_with_us_format(date, *args)
if date =~ %r{^\d+/\d+/(\d+)$}
Date.strptime date, "%m/%d/#{.length == 4 || args.first == false ? '%Y' : '%y'}"
else
parse_without_us_format(date, *args)
end
end
alias_method_chain :parse, :us_format
end
