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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Financial;
use PhpOffice\PhpSpreadsheet\Calculation\DateTimeExcel;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Financial\Constants as FinancialConstants;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
class TreasuryBill
{
/**
* TBILLEQ.
*
* Returns the bond-equivalent yield for a Treasury bill.
*
* @param mixed $settlement The Treasury bill's settlement date.
* The Treasury bill's settlement date is the date after the issue date
* when the Treasury bill is traded to the buyer.
* @param mixed $maturity The Treasury bill's maturity date.
* The maturity date is the date when the Treasury bill expires.
* @param mixed $discount The Treasury bill's discount rate
*
* @return float|string Result, or a string containing an error
*/
public static function bondEquivalentYield($settlement, $maturity, $discount)
{
$settlement = Functions::flattenSingleValue($settlement);
$maturity = Functions::flattenSingleValue($maturity);
$discount = Functions::flattenSingleValue($discount);
try {
$settlement = FinancialValidations::validateSettlementDate($settlement);
$maturity = FinancialValidations::validateMaturityDate($maturity);
$discount = FinancialValidations::validateFloat($discount);
} catch (Exception $e) {
return $e->getMessage();
}
if ($discount <= 0) {
return ExcelError::NAN();
}
$daysBetweenSettlementAndMaturity = $maturity - $settlement;
$daysPerYear = Helpers::daysPerYear(
Functions::scalar(DateTimeExcel\DateParts::year($maturity)),
FinancialConstants::BASIS_DAYS_PER_YEAR_ACTUAL
);
if ($daysBetweenSettlementAndMaturity > $daysPerYear || $daysBetweenSettlementAndMaturity < 0) {
return ExcelError::NAN();
}
return (365 * $discount) / (360 - $discount * $daysBetweenSettlementAndMaturity);
}
/**
* TBILLPRICE.
*
* Returns the price per $100 face value for a Treasury bill.
*
* @param mixed $settlement The Treasury bill's settlement date.
* The Treasury bill's settlement date is the date after the issue date
* when the Treasury bill is traded to the buyer.
* @param mixed $maturity The Treasury bill's maturity date.
* The maturity date is the date when the Treasury bill expires.
* @param mixed $discount The Treasury bill's discount rate
*
* @return float|string Result, or a string containing an error
*/
public static function price($settlement, $maturity, $discount)
{
$settlement = Functions::flattenSingleValue($settlement);
$maturity = Functions::flattenSingleValue($maturity);
$discount = Functions::flattenSingleValue($discount);
try {
$settlement = FinancialValidations::validateSettlementDate($settlement);
$maturity = FinancialValidations::validateMaturityDate($maturity);
$discount = FinancialValidations::validateFloat($discount);
} catch (Exception $e) {
return $e->getMessage();
}
if ($discount <= 0) {
return ExcelError::NAN();
}
$daysBetweenSettlementAndMaturity = $maturity - $settlement;
$daysPerYear = Helpers::daysPerYear(
Functions::scalar(DateTimeExcel\DateParts::year($maturity)),
FinancialConstants::BASIS_DAYS_PER_YEAR_ACTUAL
);
if ($daysBetweenSettlementAndMaturity > $daysPerYear || $daysBetweenSettlementAndMaturity < 0) {
return ExcelError::NAN();
}
$price = 100 * (1 - (($discount * $daysBetweenSettlementAndMaturity) / 360));
if ($price < 0.0) {
return ExcelError::NAN();
}
return $price;
}
/**
* TBILLYIELD.
*
* Returns the yield for a Treasury bill.
*
* @param mixed $settlement The Treasury bill's settlement date.
* The Treasury bill's settlement date is the date after the issue date when
* the Treasury bill is traded to the buyer.
* @param mixed $maturity The Treasury bill's maturity date.
* The maturity date is the date when the Treasury bill expires.
* @param mixed $price The Treasury bill's price per $100 face value
*
* @return float|string
*/
public static function yield($settlement, $maturity, $price)
{
$settlement = Functions::flattenSingleValue($settlement);
$maturity = Functions::flattenSingleValue($maturity);
$price = Functions::flattenSingleValue($price);
try {
$settlement = FinancialValidations::validateSettlementDate($settlement);
$maturity = FinancialValidations::validateMaturityDate($maturity);
$price = FinancialValidations::validatePrice($price);
} catch (Exception $e) {
return $e->getMessage();
}
$daysBetweenSettlementAndMaturity = $maturity - $settlement;
$daysPerYear = Helpers::daysPerYear(
Functions::scalar(DateTimeExcel\DateParts::year($maturity)),
FinancialConstants::BASIS_DAYS_PER_YEAR_ACTUAL
);
if ($daysBetweenSettlementAndMaturity > $daysPerYear || $daysBetweenSettlementAndMaturity < 0) {
return ExcelError::NAN();
}
return ((100 - $price) / $price) * (360 / $daysBetweenSettlementAndMaturity);
}
}
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