echo microtime();
// => 0.63928794 1242744141

epoch_mirco = Time.now.to_f;
epoch_full = Time.now.to_i;
 
epoch_fraction = epoch_mirco - epoch_full;
 
puts epoch_fraction.to_s + ' ' + epoch_full.to_s;
# => 0.639287948608398 1242744141