如何識別給定的日期，月份和年份是否合併法定日期？

Question

給出3個數字：DD，MM，YYYY，知道他們是否合併法定日期的最簡單方法是什麼？

例子：

14, 05, 2011  =>  Legal 
29, 02, 2011  =>  Illegal 
29, 02, 2012  =>  Legal 
35, 11, 1989  =>  Illegal 
14, 18, 2011  =>  Illegal 
14, 00, 2011  =>  Illegal 
00, 11, 1979  =>  Illegal 
31, 11, 1979  =>  Illegal 

Answer 1

您可以使用valid_date?但它YYYY, MM, DD：

irb(main):015:0> require 'date' 
=> true 
irb(main):021:0> Date::valid_date?(2011,05,14) 
=> true 
irb(main):022:0> Date::valid_date?(2011,02,29) 
=> false 
irb(main):023:0> Date::valid_date?(2012,02,29) 
=> true 

Answer 2

一種選擇是使用類似：

require 'time' 

def valid(year,month,day) 
    Time.parse "#{year}#{month}#{day}" rescue return false 
    return true 
end 

Answer 3

日期有一個方法valid_civil？ 。

require 'date' 
dates = DATA.readlines.map{|line| line.split(', ').map(&:to_i)} 
dates.each do |date| 
    d, m, y = date 
    puts Date.valid_civil?(y, m, d) 
end 

__END__ 
14, 05, 2011 
29, 02, 2011 
29, 02, 2012 
35, 11, 1989 
14, 18, 2011 
14, 00, 2011 
00, 11, 1979 
31, 11, 1979