class CFPropertyList::CFDate

geht the timestamp or the Apple timestamp
directly, you get the Time class. If you access via get_value you either
the rest of the world uses seconds since 1970. So if you access value
This class holds Time values. While Apple uses seconds since 2001,

def get_value(format=CFDate::TIMESTAMP_UNIX)

get timestamp, either UNIX or Apple timestamp 
def get_value(format=CFDate::TIMESTAMP_UNIX)
  if(format == CFDate::TIMESTAMP_UNIX) then
    return @value.to_i
  else
    return @value.to_f - CFDate::DATE_DIFF_APPLE_UNIX
  end
end

def initialize(value = nil,format=CFDate::TIMESTAMP_UNIX)

set value to defined state 
def initialize(value = nil,format=CFDate::TIMESTAMP_UNIX)
  if(value.is_a?(Time) || value.nil?) then
    @value = value.nil? ? Time.now : value
  else
    set_value(value,format)
  end
end

def set_value(value,format=CFDate::TIMESTAMP_UNIX)

set value with timestamp, either Apple or UNIX 
def set_value(value,format=CFDate::TIMESTAMP_UNIX)
  if(format == CFDate::TIMESTAMP_UNIX) then
    @value = Time.at(value)
  else
    @value = Time.at(value + CFDate::DATE_DIFF_APPLE_UNIX)
  end
end

def to_binary(bplist)

convert to binary 
def to_binary(bplist)
  return bplist.date_to_binary(@value)
end

def to_xml

convert to XML 
def to_xml
  return LibXML::XML::Node.new('date') << LibXML::XML::Node.new_text(CFDate::date_string(@value))
end