code: func DateEntropy(dateMatch match.DateMatch) float64 {
  	var entropy float64
  	if dateMatch.Year < 100 {
  		entropy = math.Log2(numDays * numMonths * 100)
  	} else {
  		entropy = math.Log2(numDays * numMonths * numYears)
  	}
  
  	if dateMatch.Separator != "" {
  		entropy += 2 //add two bits for separator selection [/,-,.,etc]
  	}
  	return entropy
  }
docs: // DateEntropy calculates the entropy provided by a date