/**
* Compute amount accrued on a principal using compound interest.
* The interest rate is annual.
* $startDate must be less than or equal to $endDate.
*
* @param double $principal
* @param double $annualRate
* @param date $startDate
* @param date $endDate
* @param int $plusOneDay
* @return double amount
*/
public function amountDueOld($principal, $annualRate, $startDate, $endDate, $plusOneDay)
{
$noOfDays = Defaults::countdays($startDate, $endDate) + $plusOneDay;
$years = 0;
for ($year = substr($startDate, 0, 4); $year <= substr($endDate, 0, 4); $year++) {
$daysInAYear = Defaults::daysInAYear($startDate);
if ($noOfDays >= $daysInAYear) {
$noOfDays = $noOfDays - $daysInAYear;
$years++;
}
}
$years = empty($daysInAYear) ? 0 : $years + $noOfDays / $daysInAYear;
return round($principal * pow(1 + $annualRate / 100, $years), 3);
}