# tablepress/3.4/libraries/vendor/PhpSpreadsheet/Calculation/Financial/TreasuryBill.php

TablePress – Tables in WordPress made easy, version 3.4. 148 lines.

- Page: https://pluginprobe.com/plugins/tablepress/3.4/code/libraries/vendor/PhpSpreadsheet/Calculation/Financial/TreasuryBill.php
- Raw: https://pluginprobe.com/plugins/tablepress/3.4/raw/libraries/vendor/PhpSpreadsheet/Calculation/Financial/TreasuryBill.php
- Modified: 2026-09-30T03:50:46+00:00

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```php
<?php

namespace TablePress\PhpOffice\PhpSpreadsheet\Calculation\Financial;

use TablePress\PhpOffice\PhpSpreadsheet\Calculation\DateTimeExcel;
use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Exception;
use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Financial\Constants as FinancialConstants;
use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Functions;
use TablePress\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 float|string $price The Treasury bill's price per $100 face value
				 * @return string|float
				 */
				public static function yield($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);
	}
}

```