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public static function subDate($day, $date = "", $timestampFlag = true, $format = "Y-m-d H:i:s") { if (empty($date)) { $now = time(); } else { 注释: 不是时间截格式,是YYYY-mm-dd HH:ii:ss格式,将它们转换成时间戳格式 if (!is_numeric($date)) { $datetime_array = explode(" ", $date); $date_array = explode("-", $datetime_array[0]); $time_array = explode(":", $datetime_array[1]); $now = mktime($time_array[0], $time_array[1], $time_array[2], $date_array[1], $date_array[2], $date_array[0]); } else { $now = $date; } } $m = $day * 24 * 60 * 60; $diff = $now + $m; if ($timestampFlag) { return $diff; } else { if (empty($format)) $format = "Y-m-d H:i:s"; $oldday = date($format, $diff); return $oldday; } }