d
Instance Public methods
Returns a date object pointing n months before self. The n should be a numeric value.
Date.new(2001,2,3) << 1 #=> #<Date: 2001-01-03 ...> Date.new(2001,1,31) << 11 #=> #<Date: 2000-02-29 ...> Date.new(2001,2,3) << -1 #=> #<Date: 2001-03-03 ...>
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