You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: time_or_datetime.rb
    path of file: ./repos/brew/Library/Homebrew/vendor/bundle-standalone/ruby/2.3.0/gems/tzinfo-1.2.5/lib/tzinfo
    
    the code of the file until where you have to start completion: require 'date'
require 'rational' unless defined?(Rational)
require 'time'

module TZInfo
  # Used by TZInfo internally to represent either a Time, DateTime or
  # an Integer timestamp (seconds since 1970-01-01 00:00:00).
  class TimeOrDateTime
    include Comparable
    
    # Constructs a new TimeOrDateTime. timeOrDateTime can be a Time, DateTime
    # or Integer. If using a Time or DateTime, any time zone information 
    # is ignored.
    #
    # Integer timestamps must be within the range supported by Time on the
    # platform being used.    
    def initialize(timeOrDateTime)
      @time = nil
      @datetime = nil
      @timestamp = nil
      
      if timeOrDateTime.is_a?(Time)
        @time = timeOrDateTime
        
        # Avoid using the slower Rational class unless necessary.
        nsec = RubyCoreSupport.time_nsec(@time)
        usec = nsec % 1000 == 0 ? nsec / 1000 : Rational(nsec, 1000)
        
        @time = Time.utc(@time.year, @time.mon, @time.mday, @time.hour, @time.min, @time.sec, usec) unless @time.utc?        
        @orig = @time
      elsif timeOrDateTime.is_a?(DateTime)
 
    
    def usec      
      if @time
        @time.usec
      elsif @datetime
        # Ruby 1.8 has sec_fraction (of which the documentation says
        # 'I do NOT recommend you to use this method'). sec_fraction no longer
        # exists in Ruby 1.9.
        
        # Calculate the sec_fraction from the day_fraction.
        ((@datetime.day_fraction - OffsetRationals.rational_for_offset(@datetime.hour * 3600 + @datetime.min * 60 + @datetime.sec)) * 86400000000).to_i
      else 
        0
      end
    end
    
    # Compares this TimeOrDateTime with another Time, DateTime, timestamp 
    # (Integer) or TimeOrDateTime. Returns -1, 0 or +1 depending 
    # whether the receiver is less than, equal to, or greater than 
    # timeOrDateTime.
    #
    # Returns nil if the passed in timeOrDateTime is not comparable with 
    # TimeOrDateTime instances.
    #
    # Comparisons involving a DateTime will be performed using DateTime#<=>.
    # Comparisons that don't involve a DateTime, but include a Time will be
    # performed with Time#<=>. Otherwise comparisons will be performed with
    # Integer#<=>.    
    def <=>(timeOrDateTime)
      return nil unless timeOrDateTime.is_a?(TimeOrDateTime) || 
                        timeOrDateTime.is_a?(Time) ||
                        timeOrDateTime.is_a?(DateTime) ||
                        timeOrDateTime.respond_to?(:to_i)
    
      unless timeOrDateTime.is_a?(TimeOrDateTime)
        timeOrDateTime = TimeOrDateTime.wrap(timeOrDateTime)
      end
          
      orig = timeOrDateTime.to_orig
      
      if @orig.is_a?(DateTime) || orig.is_a?(DateTime)
        # If either is a DateTime, assume it is there for a reason 
        # (i.e. for its larger range of acceptable values on 32-bit systems).
        to_datetime <=> timeOrDateTime.to_datetime
      elsif @orig.is_a?(Time) || orig.is_a?(Time)
        to_time <=> timeOrDateTime.to_time
      else
        to_i <=> timeOrDateTime.to_i
      end
    end