我有日期时间：
2014-08-05 13:27:00
2014-08-05 13:29:00
2014-08-05 13:36:00
2014-08-05 13:38:00
我该如何修改DateTime::modify()以设置为
2014-08-05 13:15:00
2014-08-05 13:15:00
2014-08-05 13:30:00
2014-08-05 13:30:00
（因此，请在最后15分钟标记。）
当您要求它使用时DateTime::modify()，您可以这样做：
function roundToLastQuarterHour($date_string) {
$date = new DateTime($date_string);
// Remove any seconds, we don't need them
$seconds = $date->format('s');
$date->modify('-' . $seconds . ' seconds');
// Store the original number of minutes on the datetime
$original_minutes = $date->format('i');
// Calculate how many minutes past the last quarter hour
$remaining_minutes = $original_minutes - ($original_minutes - ($original_minutes % 15));
// Modify the minutes, remove the number of minutes past the last quarter of an hour
$date->modify('-' . $remaining_minutes . ' minutes');
return $date;
}
roundToLastQuarterHour('2014-08-05 13:27:00')
// 2014-08-05 13:15:00
roundToLastQuarterHour('2014-08-05 13:29:00')
// 2014-08-05 13:15:00
roundToLastQuarterHour('2014-08-05 13:36:00')
// 2014-08-05 13:30:00
roundToLastQuarterHour('2014-08-05 13:38:00')
// 2014-08-05 13:30:00
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