Alternative: >> require 'time' => true >> t1 = Time.parse("12:35:10.000757") => Mon Sep 20 12:35:10 +0100 2010 >> t2 = Time.parse("12:35:10.000759") => Mon Sep 20 12:35:10 +0100 2010 >> t2 - t1 => 2.0e-06 -- Posted via http://www.ruby-forum.com/.