vendor/phpoffice/phpexcel/Documentation/Examples/Calculations/DateTime/TIMEVALUE.php

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<?php

error_reporting(E_ALL);
set_time_limit(0);

date_default_timezone_set('Europe/London');


?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

<title>PHPExcel Calculation Examples</title>

</head>
<body>

<h1>TIMEVALUE</h1>
<h2>Converts a time in the form of text to a serial number.</h2>
<?php

/** Include path **/
set_include_path(get_include_path() . PATH_SEPARATOR . '../../../../Classes/');

/** Include PHPExcel */
include 'PHPExcel.php';


// Create new PHPExcel object
$objPHPExcel = new PHPExcel();
$worksheet = $objPHPExcel->getActiveSheet();

// Add some data
$testDates = array(	'3:15',	'13:15',	'15:15:15',	'3:15 AM',	'3:15 PM',	'5PM',	'9:15AM',	'13:15AM'
				  );
$testDateCount = count($testDates);

for($row = 1; $row <= $testDateCount; ++$row) {
	$worksheet->setCellValue('A'.$row, $testDates[$row-1]);
	$worksheet->setCellValue('B'.$row, '=TIMEVALUE(A'.$row.')');
	$worksheet->setCellValue('C'.$row, '=B'.$row);
}

$worksheet->getStyle('C1:C'.$testDateCount)
          ->getNumberFormat()
          ->setFormatCode('hh:mm:ss');


echo '<hr />';


// Test the formulae
?>
<table border="1" cellspacing="0">
	<tr>
		<th>Time String</th>
		<th>Formula</th>
		<th>Excel TimeStamp</th>
		<th>Formatted TimeStamp</th>