Ruby time to .NET ticks

gistfile1.txt

class Time
  # See http://msdn.microsoft.com/en-us/library/system.datetime.ticks.aspx
  TICKS_SINCE_EPOCH = Time.utc(0001,01,01).to_i * 10000000

  def ticks
    to_i * 10000000 + nsec / 100 - TICKS_SINCE_EPOCH
  end
end

$ rvm use 1.9.3
Using /Users/godfrey/.rvm/gems/ruby-1.9.3-p125
$ irb
>> class Time
>>   # See http://msdn.microsoft.com/en-us/library/system.datetime.ticks.aspx
?>   TICKS_SINCE_EPOCH = Time.utc(0001,01,01).to_i * 10000000
>> 
?>   def ticks
>>     to_i * 10000000 + nsec / 100 - TICKS_SINCE_EPOCH
>>   end
>> end
=> nil
>> 
?> Time.now.ticks
=> 634739243347336440
>> 

Hi, I have two questions, kindly reply.

following are the steps:
rvm use 1.9.3
Using /usr/local/rvm/gems/ruby-1.9.3-p0

then rails c

then following things.

first, how can i get nsec for this statement? ,

to_i * 10000000 + nsec / 100 - TICKS_SINCE_EPOCH
I tried this Time.new.nsec, it gave me some string. So I tried to use this in following line and it gave me this error.

to_i * 10000000 + Time.new.nsec / 100 - TICKS_SINCE_EPOCH

then it says:

undefined local variable or method 'to_i' for main:Object

kindly guide me how to calculate ticks in ruby thanks a lot,
regards,
MK.

did some updates for 1.8.7, added some description for myself but maybe it would help somebody else https://gist.github.com/morkevicius/10549920

Any improvements required for Ruby 2.5?