class TZInfo::TZDataTime

:nodoc:
is either :utc, :standard or :wall_clock.
A tz data time definition - an hour, minute, second and reference. Reference

def initialize(spec) 

def initialize(spec)
  raise "Invalid time: #{spec}" if spec !~ /^([0-9]+)(:([0-9]+)(:([0-9]+))?)?([wguzs])?$/
  
  @hour = $1.to_i
  @minute = $3.nil? ? 0 : $3.to_i
  @second = $5.nil? ? 0 : $5.to_i
  
  if $6 == 's'
    @ref = :standard
  elsif $6 == 'g' || $6 == 'u' || $6 == 'z'
    @ref = :utc
  else
    @ref = :wall_clock
  end
end

def to_utc(utc_offset, std_offset, year, month, day)

Converts the time to UTC given a utc_offset and std_offset. 
def to_utc(utc_offset, std_offset, year, month, day)      
  result = DateTime.new(year, month, day, @hour, @minute, @second)
  offset = 0
  offset = offset + utc_offset if @ref == :standard || @ref == :wall_clock            
  offset = offset + std_offset if @ref == :wall_clock       
  result - Rational(offset, 86400)            
end