如何在Ruby中创建新的Date实例

Question

如何在给定日期的IRB中创建新的Date对象.以下不起作用.

1.9.3p194 :053 > require 'active_support'
 => true 
1.9.3p194 :054 > Date.new
 => #<Date:0x9d80730> 
1.9.3p194 :055 > Date.parse('12/01/2012')
NoMethodError: undefined method `parse' for Date:Class
        from (irb):55

1.9.3p194 :055 > Date.new('12/01/2012')
ArgumentError: wrong number of arguments(1 for 0)

Answer 1

根据日期文件:

require 'date'

Date.new(2001,2,3)           #=> #<Date: 2001-02-03 ...>
Date.jd(2451944)             #=> #<Date: 2001-02-03 ...>
Date.ordinal(2001,34)        #=> #<Date: 2001-02-03 ...>
Date.commercial(2001,5,6)    #=> #<Date: 2001-02-03 ...>
Date.parse('2001-02-03')     #=> #<Date: 2001-02-03 ...>
Date.strptime('03-02-2001', '%d-%m-%Y')
                             #=> #<Date: 2001-02-03 ...>
Time.new(2001,2,3).to_date   #=> #<Date: 2001-02-03 ...>

Answer 2

1.9.3-p125 :012 > require 'date'
 => true 
1.9.3-p125 :013 > Date::new(2012,02,03)
 => #<Date: 2012-02-03 ((2455961j,0s,0n),+0s,2299161j)> 
1.9.3-p125 :014 >