code: public DateTime toDateTime(double days) {
  	long utc = Math.round(days * DAY_MILLIS);
  	utc -= CF_UNIX_OFFSET;
  	utc -= getLocalTimeZoneOffset(utc);
  	return new DateTimeImpl(utc, false);
      }
docs: returns a date time instance by a number, the conversion from the double to date is o the base of
  the CFML rules.
  
  @param days double value to convert to a number
  @return DateTime Instance