红宝石 |日期 <=>() 方法
Date#<=>是比较两个日期对象的 Date 类方法。
Syntax: Date<=>b
Parameter: Date values
Return: 1 if a is greater than b
-1 if a is less than b
0 if a equals b
示例 #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 <=> c}\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 : -1
Date b form : 1
Date c form : 1
示例 #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 <=> c}\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 : -1
Date b form : 1
Date c form : 1