Ruby | Date << function
Last Updated :
09 Jan, 2020
Date#<<() is a Date class method which returns the date object pointing ‘n’ (numeric value argument) months before self.
Syntax: Date.<<()
Parameter: Date values
Return: date object pointing n months before self. The argument n should be a numeric value.
Example #1 :
require 'date'
a = Date. new ( 2019 , 1 , 1 )
b = Date.jd( 2452004 )
c = Date.ordinal( 2019 , 12 )
puts "Date a : #{a}\n\n"
puts "Date b : #{b}\n\n"
puts "Date c : #{c}\n\n\n\n"
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"
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Output :
Date a : 2019-01-01
Date b : 2001-04-04
Date c : 2019-01-12
Date a << form : 2018-11-01
Date b << form : 2000-11-04
Date c << form : 2018-10-12
Example #2 :
require 'date'
a = Date.parse( '2019-01-01' )
b = Date.strptime( '03-12-2019' , '%d-%m-%Y' )
c = Date.commercial( 2019 , 5 , 6 )
puts "Date a : #{a}\n\n"
puts "Date b : #{b}\n\n"
puts "Date c : #{c}\n\n\n\n"
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"
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Output :
Date a : 2019-01-01
Date b : 2019-12-03
Date c : 2019-02-02
Date a << form : 2018-11-01
Date b << form : 2019-07-03
Date c << form : 2018-11-02
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