End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

Time.month_days

month_days(y, m)

# File tmp/rubies/ruby-3.0.5/lib/time.rb, line 139
def month_days(y, m)
  if ((y % 4 == 0) && (y % 100 != 0)) || (y % 400 == 0)
    LeapYearMonthDays[m-1]
  else
    CommonYearMonthDays[m-1]
  end
end

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