class ActiveRecord::ConnectionAdapters::PostgreSQL::OID::DateTime

def cast_value(value)
  case value
  when "infinity" then ::Float::INFINITY
  when "-infinity" then -::Float::INFINITY
  when / BC$/
    value = value.sub(/^\d+/) { |year| format("%04d", -year.to_i + 1) }
    super(value.delete_suffix!(" BC"))
  else
    super
  end
end

def real_type_unless_aliased(real_type)
  ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.datetime_type == real_type ? :datetime : real_type
end

def type_cast_for_schema(value)
  case value
  when ::Float::INFINITY then "::Float::INFINITY"
  when -::Float::INFINITY then "-::Float::INFINITY"
  else super
  end
end