如何使用PhpSpreadsheet从表格单元格中检索日期？

Question

I have xlsx tables and I use PhpSpreadsheet to parse them. Some cells format is date. The problem is that PhpSpreadsheet returns the values from date-formatted cells in an unspecified format:

// How it looks in excel: 2017.04.08 0:00
$value = $worksheet->getCell('A1')->getValue();  // 42833 - doesn't look like a UNIX time

How to get the date from a cell in form of a UNIX time or a DateTimeInterface instance?

Answer 1

The value is amount of days passed since 1900. You can use the PhpSpreadsheet built-in functions to convert it to a unix timestamp:

$value = $worksheet->getCell('A1')->getValue();
$date = \PhpOffice\PhpSpreadsheet\Shared\Date::excelToTimestamp($value);

Or to a PHP DateTime object:

$value = $worksheet->getCell('A1')->getValue();
$date = \PhpOffice\PhpSpreadsheet\Shared\Date::excelToDateTimeObject($value);