将 php 日期转换为 excel 数字字符串

Question

I need to convert a PHP date into an Excel number; for example, 2019-06-01 in PHP is 43617 in Excel.

$Result must be the same as if I did ($June_date - $Date_work)/365 in Excel.

The code I've tried so far is below, but it doesn't work.

$Date_work = ('2016-03-01');          
$June_date =  ('2019-06-01'); 

$Result = ($June_date - $Date_work); 
echo "$Result";

Answer 1

$date = '2019-06-01';

$excelNumber = strtotime($date." UTC")/86400 + 25569;

echo $excelNumber;  //43617

or alternatively with the DateTime extension dt :

$excelNumber = dt::create($date,'UTC')->getMsTimeStamp();

For the difference in days you need not convert to excel-number

$Date_work = '2016-03-01';          
$June_date =  '2019-06-01'; 
$diffDays = date_create($Date_work)->diff(date_create($June_date))->days;
//1187