Ruby Date downto()用法及代码示例

Date＃downto()是Date类方法，它等效于step(min，-1){| date | …}并返回枚举数。

用法：Date.downto()

参数：日期值

返回：相当于step(min，-1){| date | …}并返回枚举数。

示例1:

# Ruby code for Date.downto() method 
  
# loading date 
require 'date'
  
# declaring Date  
a = Date.new(2019, 1, 1) 
  
# declaring Date 
b = Date.jd(2452004) 
  
# declaring Date 
c = Date.ordinal(2019, 12) 
  
# Date  
puts "Date a : #{a}\n\n"
puts "Date b : #{b}\n\n"
puts "Date c : #{c}\n\n\n\n"
  
  
# downto form  
puts "Date a downto form : #{a.downto(23)}\n\n"
puts "Date b downto form : #{b.downto(21)}\n\n"
puts "Date c downto form : #{c.downto(5)}\n\n"

输出：

Date a : 2019-01-01

Date b : 2001-04-04

Date c : 2019-01-12



Date a downto form : #

Date b downto form : #

Date c downto form : #

示例2:

# Ruby code for Date.downto() method 
  
# loading date 
require 'date'
  
# declaring Date  
a = Date.parse('2019-01-01') 
  
# declaring Date 
b = Date.strptime('03-12-2019', '%d-%m-%Y') 
  
# declaring Date 
c = Date.commercial(2019, 5, 6) 
  
# Date  
puts "Date a : #{a}\n\n"
puts "Date b : #{b}\n\n"
puts "Date c : #{c}\n\n\n\n"
  
  
# downto form  
puts "Date a downto form : #{a.downto(23)}\n\n"
puts "Date b downto form : #{b.downto(21)}\n\n"
puts "Date c downto form : #{c.downto(5)}\n\n"

输出：

Date a : 2019-01-01

Date b : 2019-12-03

Date c : 2019-02-02



Date a downto form : #

Date b downto form : #

Date c downto form : #

相关用法

注：本文由纯净天空筛选整理自Kirti_Mangal大神的英文原创作品 Ruby | Date downto() function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。