计算PHP中2个日期之间的年数

Question

我需要从提供的 2 个日期中获取年数。这是我的代码：

function daysDifference($endDate, $beginDate)
{
   $date_parts1=explode("-", $beginDate);
   $date_parts2=explode("-", $endDate);

   $start_date=gregoriantojd($date_parts1[1], $date_parts1[2], $date_parts1[0]);
   $end_date=gregoriantojd($date_parts2[1], $date_parts2[2], $date_parts2[0]);
   $diff = $end_date - $start_date;
   echo $diff;
   $years = floor($diff / (365.25*60*60*24));
   return $years;
}

echo daysDifference('2011-03-12','2008-03-09');

$diff 给出一个数字输出。当我返回$years 时，我得到了0。我做错了什么？

Answer 1

$d1 = new DateTime('2011-03-12');
$d2 = new DateTime('2008-03-09');

$diff = $d2->diff($d1);

echo $diff->y;

Answer 2

在 PHP 5.2 机器上（是的，它们仍然存在）所以没有 DateTime::diff() 支持，我最终使用了这个：

$dateString='10-05-1975';
$years = round((time()-strtotime($dateString))/(3600*24*365.25))

Answer 3

$start_date 和 $end_date' 值是天数，而不是秒数。所以你不应该将 $diff 与 365.25*60*60*24 分开。

function daysDifference($endDate, $beginDate)
{

   $date_parts1 = explode("-", $beginDate);
   $date_parts2 = explode("-", $endDate);
   $start_date = gregoriantojd($date_parts1[1], $date_parts1[2], $date_parts1[0]);
   $end_date = gregoriantojd($date_parts2[1], $date_parts2[2], $date_parts2[0]);
   $diff = abs($end_date - $start_date);
   $years = floor($diff / 365.25);
   return $years;
}

echo daysDifference('2011-03-12','2008-03-09');

Answer 4

如果您想要两个日期之间的年数，为什么不直接使用以下内容：

function yearsDifference($endDate, $beginDate)
{
   $date_parts1=explode("-", $beginDate);
   $date_parts2=explode("-", $endDate);
   return $date_parts2[0] - $date_parts1[0];
}

echo yearsDifference('2011-03-12','2008-03-09');

在这种情况下，你会得到什么：

3

Answer 5

伙计们，这是我曾经使用过的一个很好的代码......这不是我的想法......我只是从网上的某个地方得到的......

它也有多种选择，希望对你有所帮助............

    function datediff($interval, $datefrom, $dateto, $using_timestamps = false) {
    /*
    $interval can be:
    yyyy - Number of full years
    q - Number of full quarters
    m - Number of full months
    y - Difference between day numbers
        (eg 1st Jan 2004 is "1", the first day. 2nd Feb 2003 is "33". The datediff is "-32".)
    d - Number of full days
    w - Number of full weekdays
    ww - Number of full weeks
    h - Number of full hours
    n - Number of full minutes
    s - Number of full seconds (default)
    */

    if (!$using_timestamps) {
        $datefrom = strtotime($datefrom, 0);
        $dateto = strtotime($dateto, 0);
    }
    $difference = $dateto - $datefrom; // Difference in seconds

    switch($interval) {

    case 'yyyy': // Number of full years

        $years_difference = floor($difference / 31536000);
        if (mktime(date("H", $datefrom), date("i", $datefrom), date("s", $datefrom), date("n", $datefrom), date("j", $datefrom), date("Y", $datefrom)+$years_difference) > $dateto) {
            $years_difference--;
        }
        if (mktime(date("H", $dateto), date("i", $dateto), date("s", $dateto), date("n", $dateto), date("j", $dateto), date("Y", $dateto)-($years_difference+1)) > $datefrom) {
            $years_difference++;
        }
        $datediff = $years_difference;
        break;

    case "q": // Number of full quarters

        $quarters_difference = floor($difference / 8035200);
        while (mktime(date("H", $datefrom), date("i", $datefrom), date("s", $datefrom), date("n", $datefrom)+($quarters_difference*3), date("j", $dateto), date("Y", $datefrom)) < $dateto) {
            $months_difference++;
        }
        $quarters_difference--;
        $datediff = $quarters_difference;
        break;

    case "m": // Number of full months

        $months_difference = floor($difference / 2678400);
        while (mktime(date("H", $datefrom), date("i", $datefrom), date("s", $datefrom), date("n", $datefrom)+($months_difference), date("j", $dateto), date("Y", $datefrom)) < $dateto) {
            $months_difference++;
        }
        $months_difference--;
        $datediff = $months_difference;
        break;

    case 'y': // Difference between day numbers

        $datediff = date("z", $dateto) - date("z", $datefrom);
        break;

    case "d": // Number of full days

        $datediff = floor($difference / 86400);
        break;

    case "w": // Number of full weekdays

        $days_difference = floor($difference / 86400);
        $weeks_difference = floor($days_difference / 7); // Complete weeks
        $first_day = date("w", $datefrom);
        $days_remainder = floor($days_difference % 7);
        $odd_days = $first_day + $days_remainder; // Do we have a Saturday or Sunday in the remainder?
        if ($odd_days > 7) { // Sunday
            $days_remainder--;
        }
        if ($odd_days > 6) { // Saturday
            $days_remainder--;
        }
        $datediff = ($weeks_difference * 5) + $days_remainder;
        break;

    case "ww": // Number of full weeks

        $datediff = floor($difference / 604800);
        break;

    case "h": // Number of full hours

        $datediff = floor($difference / 3600);
        break;

    case "n": // Number of full minutes

        $datediff = floor($difference / 60);
        break;

    default: // Number of full seconds (default)

        $datediff = $difference;
        break;
    }    

    return $datediff;

} 

echo datediff('yyyy','2009-01-16','2011-03-16');