PHP date calculation

Question

What is the best (date format independent way) in PHP to calculate difference in days between two dates in specified format.

I tried the following function:

Answer 1

The following works for me. Believe I found it on the php.net docs somewhere.

*Edit - Woops, didn't see csl's post. This is the exact function from his link, must have been where I found it. ;)

//Find the difference between two dates
function dateDiff($startDate, $endDate)
{
    // Parse dates for conversion
    $startArry = date_parse($startDate);
    $endArry = date_parse($endDate);

    // Convert dates to Julian Days
    $start_date = gregoriantojd($startArry["month"], $startArry["day"], $startArry["year"]);
    $end_date = gregoriantojd($endArry["month"], $endArry["day"], $endArry["year"]);

    // Return difference
    return round(($end_date - $start_date), 0);
}