Ruby Date – 函数

Date#-()是一个Date类方法，如果对象是日期类型的对象，则返回两个日期之间的差值。

语法。Date.-()

参数。日期值

返回：两个日期之间的差异

例子 #1 :

# Ruby code for Date.-() 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"
  
  
# - form 
puts "Date a - form : #{a - Rational(3, 2)}\n\n"
puts "Date b - form : #{b - Rational(10, 2)}\n\n"
puts "Date c - form : #{c - Rational(10, 4)}\n\n"

输出:

Date a : 2019-01-01

Date b : 2001-04-04

Date c : 2019-01-12



Date a - form : 2018-12-30

Date b - form : 2001-03-30

Date c - form : 2019-01-09

例子 #2 :

# Ruby code for Date.-() 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"
  
  
# - form 
puts "Date a - form : #{a - Rational(3, 2)}\n\n"
puts "Date b - form : #{b - Rational(10, 2)}\n\n"
puts "Date c - form : #{c - Rational(10, 4)}\n\n"

输出:

Date a : 2019-01-01

Date b : 2019-12-03

Date c : 2019-02-02



Date a - form : 2018-12-30

Date b - form : 2019-11-28

Date c - form : 2019-01-30