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Maintain proleptic gregorian in Time#advance
Time#advance uses Time#to_date and Date#advance to calculate a new date. The Date object returned by Time#to_date is constructed with the assumption that the Time object represents a proleptic gregorian date, but it is configured to observe the default julian calendar reform date (2299161j) for purposes of calculating month, date and year: Time.new(1582, 10, 4).to_date.to_s # => "1582-09-24" Time.new(1582, 10, 4).to_date.gregorian.to_s # => "1582-10-04" This patch ensures that when the intermediate Date object is advanced to yield a new Date object, that the Time object for return is contructed with a proleptic gregorian month, date and year.
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