PHP | Spreadsheet | Setting a date and/or time value in a cell

In PHP Spreadsheet, the date or time values are stored in an excel sheet in the form of timestamp which is a floating point value. So in order to store date/time in a human-readable format, need to calculate the correct excel timestamp and finally set a number format mask.

Example:

<?php

// PHP program to set a date time value in excel sheet
require_once('vendor/autoload.php');

use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;

// Creates New Spreadsheet
$spreadsheet = new Spreadsheet();

// Retrieve the current active worksheet
$sheet = $spreadsheet->getActiveSheet();

// Set the number format mask so that the excel timestamp
// will be displayed as a human-readable date/time
$spreadsheet->getActiveSheet()->getStyle('A1')
    ->getNumberFormat()
    ->setFormatCode(
    \PhpOffice\PhpSpreadsheet\Style\NumberFormat::FORMAT_DATE_DATETIME
    );

// Get current date and timestamp
// Convert to an Excel date/time
$dateTime = time();
$excelDateValue = \PhpOffice\PhpSpreadsheet\Shared\Date::PHPToExcel(
                  $dateTime );

// Set cell A1 with the Formatted date/time value
$sheet->setCellValue('A1',$excelDateValue);

// Write an .xlsx file
$writer = new Xlsx($spreadsheet);

// Save .xlsx file to the current directory
$writer->save('gfgdate.xlsx');
?>

Output:

Reference: https://phpspreadsheet.readthedocs.io/en/develop/topics/accessing-cells/