Convert Excel dates into PHP timestamps

[ccvv]

Having trouble getting your PHP script to build dates from Excel using mktime() ?  Me too. Everything’s one day off?  I know it.  Here’s what I found.

The proper way to convert Excel dates into PHP-friendly timestamps using mktime():

// The date 6/30/2009 is stored as 39994 in Excel
$days = 39994;

// But you must subtract 1 to get the correct timestamp
$ts = mktime(0,0,0,1,[B]$days-1[/B],1900);

// So, this would then match Excel’s representation:
echo date(“m/d/Y”,$ts); 

Excel uses “number of days since Jan. 1, 1900″ to store its dates.  It also treats 1900 as a leap year when it wasn’t, thus there is an extra day which must be accounted for in PHP (and the rest of the world).  Subtracting 1 from Excel’s number will fix this problem.

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[jaredovi]

Excel stores dates internally as number of days since January 1, 1900.
For example: "June 9th, 2011 10:30 AM" would be stored as "40703.4375".
40703 is the number of full days since 01/01/1900 and 0.4375 represents the time (10.5/24 = 0.4375).

When you process dates read from an Excel spreadsheet (e.g. using PHPExcel) you often want to convert them into a UNIX timestamp i.e. a number of seconds elapsed since midnight of January 1, 1970 UTC.

Here is a PHP code to do that:

// Numbers of days between January 1, 1900 and 1970 (including 19 leap years)
define("MIN_DATES_DIFF", 25569);
  
// Numbers of second in a day:
define("SEC_IN_DAY", 86400);   
 
function excel2timestamp($excelDate)
{
   if ($excelDate <= MIN_DATES_DIFF)
      return 0;
 
   return  ($excelDate - MIN_DATES_DIFF) * SEC_IN_DAY;
} 

Although the code above is written in PHP the function should be very similar in any other language e.g. C# or java. If the provided date is earlier than 1/1/1970 then the minimal timestamp value will be returned.

Alternative solution:

If you provide the Excel spreadsheet that you later on read from in your app you could add a hidden cell that would calculate the timestamp for you, within the spreadsheet.
Assuming that B2 is the cell that stores your date the formula for calculating timestamp would be:

=(B2-DATE(1970,1,1))*86400

Now you only need to read the calculated value from the hidden cell.

Source: blogspot.com

[katejohn303]

40703 is the quantity of entire days since 01/01/1900 and 0.4375 speaks to the time (10.5/24 = 0.4375). When you process dates read from an Excel spreadsheet (for example utilizing PHPExcel) you regularly need to change over them into a UNIX timestamp for example various seconds passed since midnight of January 1, 1970 UTC.

[luisao.ba]

Thank You!

[katejohn303]

Convert Unix dates for export to Excel with PHP or MySQL Unix timestamps are in UTC (GMT), so the first thing we need to do is convert to

[SwiftMove]

Convert Excel dates into PHP timestamps. Experiencing difficulty getting your PHP content to fabricate dates from Excel utilizing mktime() ? Me as well. Everything's..