2 个日期范围之间的交集数

Question

我的 Codeigniter 应用程序中有 2 个日期范围，我想计算这些日期范围之间相交的天数。有任何想法吗？

日期 1 开始 = YYYY-MM-DD；日期 1 结束 = YYYY-MM-DD；

日期2开始 = YYYY-MM-DD; 日期2结束 = YYYY-MM-DD;

Answer 1

像这样的东西应该有效

$datetimeStart1 = new DateTime('2015-12-10');
$datetimeEnd1 = new DateTime('2015-12-20');

$datetimeStart2 = new DateTime('2015-12-12');
$datetimeEnd2 = new DateTime('2015-12-28');

// following http://stackoverflow.com/questions/325933/determine-whether-two-date-ranges-overlap
if ($datetimeStart1 < $datetimeEnd2 && $datetimeEnd1 > $datetimeStart2) {
    echo min($datetimeEnd1,$datetimeEnd2)->diff(max($datetimeStart2,$datetimeStart1))->days+1;
} else {
    echo 'no overlap';
}

演示： http: //3v4l.org/9Pecb

仅适用于 PHP 5.2

$datetimeStart1 = new DateTime('2015-12-10');
$datetimeStart1 = $datetimeStart1->format('U');
$datetimeEnd1 = new DateTime('2015-12-20');
$datetimeEnd1 = $datetimeEnd1->format('U');

$datetimeStart2 = new DateTime('2015-12-12');
$datetimeStart2 = $datetimeStart2->format('U');
$datetimeEnd2 = new DateTime('2015-12-28');
$datetimeEnd2 = $datetimeEnd2->format('U');

// following http://stackoverflow.com/questions/325933/determine-whether-two-date-ranges-overlap
if ($datetimeStart1 < $datetimeEnd2 && $datetimeEnd1 > $datetimeStart2) {
    echo round(
        ((min($datetimeEnd1,$datetimeEnd2)) - (max($datetimeStart2,$datetimeStart1))) / (60*60*24)) + 1;
} else {
    echo 'no overlap';
}

演示： http: //3v4l.org/a1WLk